A complete guide to bruxism and occlusion: a map of the domain, from the evolution of the definition and the limits of assessment through the evidence on consequences to occlusal splints and occlusal adjustment

A complete guide to bruxism and occlusion: a map of the domain, from the evolution of the definition and the limits of assessment through the evidence on consequences to occlusal splints and occlusal adjustment

TL;DR

Bruxism is a repetitive jaw-muscle activity [Fn1], with a sleep type and an awake type [Fn2]; the 2018 international consensus regards it, in otherwise healthy individuals, as a behaviour rather than a disorder [Fn6], and no single approach to management works universally [Fn28].

(60 characters in the zh-Hant original, [Fn] markers and spaces not counted; 60 characters including spaces, both within the 60-character limit)

Introduction

This article is general oral-health education based on international literature. It does not address any country's insurance or regulations; consult local rules for care pathways and costs.

This article deliberately does not answer “am I actually grinding my teeth, and should I have a splint made”. That kind of individual judgement can only be made by a dentist who has examined your teeth and your history. What it handles is the domain-level gap: why the definition of this term has been changed three times in twelve years, which axes the professional community uses to describe it, why the frequently quoted prevalence figures can run all the way from 1% [Fn16] to 43% [Fn106], how far the folk certainty that “grinding wears your teeth out” holds up in the literature, what an occlusal splint can and cannot do, and why “grinding the teeth down to adjust the bite” is, on the evidence, an action that has to be taken very conservatively.

One thing has to be stated first, because it governs how every later section should be read: up to the point at which the international consensus was formed in 2013, this field had no agreement on what bruxism is or how it should be graded [Fn5]; and the 2018 consensus went further, proposing that in otherwise healthy individuals bruxism should not be regarded as a disorder but as a behaviour that may be a risk (or protective) factor for certain clinical consequences [Fn6]. “Behaviour” and “disorder” are not a difference of wording; the choice determines the threshold for intervening.

1. The evolution of the definition: why this term keeps changing

1-1 2013: pinning the term down first

In a written consensus, an international group of bruxism experts defined bruxism as a repetitive jaw-muscle activity characterised by clenching or grinding of the teeth and/or by bracing or thrusting of the mandible [Fn1]. The same consensus states that bruxism has two distinct circadian manifestations [Fn2]: it can occur during sleep (indicated as sleep bruxism) or during wakefulness (indicated as awake bruxism) [Fn3]. So that the definition could be operationalised, that consensus proposed a diagnostic grading system of “possible / probable / definite” [Fn4].

1-2 2018: from “disorder” to “behaviour”

The 2018 assessment consensus report did three things: it defined sleep and awake bruxism respectively as masticatory muscle activities occurring during sleep (characterised as rhythmic or non-rhythmic) and during wakefulness (characterised by repetitive or sustained tooth contact and/or by bracing or thrusting of the mandible) [Fn9]; it stated explicitly that in otherwise healthy individuals bruxism should not be considered a disorder, but rather a behaviour that can be a risk (and/or protective) factor for certain clinical consequences [Fn6]; and it noted that assessment can employ non-instrumental approaches (notably self-report) and instrumental approaches (notably electromyography) [Fn7].

There is also one conclusion that is often overlooked but is critical: for otherwise healthy individuals, standard cut-off points should not be used to establish the presence or absence of bruxism [Fn8]. In other words, this field itself objects to drawing a line that sorts people into “has bruxism” and “does not have bruxism”.

1-3 2025: the update to the current version

The current definition report comes from a closed (invitation-only) full-day workshop at the 2024 annual session of the International Association for Dental Research (IADR), which convened international bruxism experts to discuss the current definitions [Fn13]. The background to that report is that some aspects of the currently proposed, expert-driven definitions raise questions and cause confusion among clinicians, researchers, educators and patients [Fn14]. One of the report's three purposes is to provide a glossary of the existing definitions [Fn11].

Two things were specifically changed: the addendum “in otherwise healthy individuals” has been removed from the individual definitions of sleep bruxism and awake bruxism [Fn10]; and the hierarchical organisation originally proposed for the grading system was revised and clarified, so as to incorporate terms based on self-report, clinical examination and device-based assessment [Fn12].

The portable conclusion of this section: when you encounter inconsistent descriptions of “bruxism” in material from different years, it is usually not that someone has it wrong, but that the version of the definition differs. Check the version when you cite.

2. Prevalence: one and the same thing, so why do the figures differ so much

This is a passage of the field that is extremely easy to misread, so it is handled separately.

The four sets of figures do not contradict one another, because they are not measuring the same thing: self-report, clinical examination and instrumental determination yield different denominators and different numerators. The 2018 consensus described above already states plainly that assessment divides into a non-instrumental and an instrumental route [Fn7], and the figure obtained by polysomnography is markedly higher than the self-report figures [Fn106][Fn105].

The methodological limits have to be set out alongside them: in the meta-analysis of awake bruxism, none of the included studies scored high in methodological quality across all nine items of the JBI checklist [Fn65], and the authors' conclusion is that the prevalence of awake bruxism in adults was low but that there was substantial methodological variability, which highlights the need for standardised guidelines [Fn64]. The global prevalence review states of itself that it could not analyse prevalence in Africa and Australia because of insufficient samples [Fn108]. The umbrella review likewise notes that associated factors and the effects of bruxism on the structures of the masticatory system were considerably heterogeneous and inconsistent [Fn22].

The portable way to read this: whenever you see any bruxism prevalence figure, first ask “was it measured by self-report, by clinical examination or by an instrument, and in whom”. The gap can exceed thirty percentage points, and that is not a contradiction but a difference in the method of measurement.

3. How you would know whether you grind: three levels and the ceiling on their validity

3-1 The three levels

Under the 2018 and 2025 consensus versions, assessment tools divide into the three classes of self-report, clinical examination and device-based [Fn7][Fn12], with the degree of confidence expressed through the grading of “possible / probable / definite” [Fn4]. Determination of sleep bruxism at research level normally presupposes polysomnography (PSG) and/or electromyography (EMG) [Fn27].

3-2 How low the validity of self-report is: a finding that has to be stated honestly

A case-control study in women with chronic myofascial temporomandibular disorders (124 of them) and a demographically matched control group (46) [Fn122][Fn122b] compared self-report directly against laboratory PSG determination [Fn117], and concluded that awareness of tooth grinding is highly unlikely to be a valid indicator of true sleep bruxism [Fn115]; self-report failed to significantly predict the presence or absence of moderate or severe sleep bruxism as assessed by PSG [Fn117].

This sentence will sting a good many people: “my family says I grind loudly at night” is not enough to constitute a diagnostic-level determination. But the reverse holds equally: nobody hearing it does not mean it is absent.

3-3 Why not simply send everyone for PSG

The same study writes plainly in its background section that laboratory polysomnographic assessment is extremely expensive and time-consuming [Fn116]. That is the practical reason why a great many studies in this field switch to self-report, and it is also the source of the limits on their evidential weight.

3-4 How the sleep-medicine side sees it

A clinical guidance paper interpreting the diagnostic criteria of the International Classification of Sleep Disorders, third edition, text revision (ICSD-3-TR), published in 2023 by the American Academy of Sleep Medicine (AASM), notes that the classification provides a standardised framework for identifying and classifying sleep disorders in medical settings [Fn75], but that its adaptation to dental clinical and research contexts remains complex [Fn78], the conceptual divergence between the two sides lying above all in whether sleep bruxism is a jaw motor behaviour or a sleep-related movement disorder [Fn76]. That paper also records that sleep bruxism may often be encountered by sleep physicians as an incidental finding during sleep recordings carried out for other sleep disorders [Fn77].

The portable conclusion of this section: “confirming” bruxism carries different thresholds in different professions and with different tools; this article provides no self-assessment scale of any kind.

4. Associated factors and comorbidities: not a single cause

4-1 The consistently associated factors listed by the umbrella review

After compiling 41 systematic reviews [Fn15], the factors held to be consistently associated with bruxism include alcohol, caffeine, tobacco, some psychotropic medications, oesophageal acidification and second-hand smoke [Fn17]; the signs and symptoms of temporomandibular disorders present what is described as a plausible association [Fn18].

⚠ The factors listed above are a record of associations at population level. They are not behavioural advice and not medication instructions; any adjustment to existing medication has to be decided by the prescribing doctor.

4-2 The sleep-disorder side

A systematic review in adults (37 studies screened from 1,539) [Fn123] found that the prevalence of sleep bruxism was higher than in the general population among adult patients with obstructive sleep apnoea, restless legs syndrome, periodic limb movement during sleep, sleep-related gastro-oesophageal reflux disease, REM behaviour disorder and sleep-related epilepsy [Fn101]. The authors also label honestly that the specific mechanisms behind these positive associations could not be identified [Fn102], and that sleep arousal may be a common factor with which these disorders are associated [Fn103]. That review therefore calls for more screening for sleep bruxism in patients with the sleep disorders above [Fn104].

4-3 The psychological side

A systematic review with qualitative analysis in adults (10 studies included out of 92) [Fn100] concludes that there seems to be an association between bruxism, temporomandibular disorders and psychological factors (stress, anxiety, depression) [Fn98]; the authors also state that more research is needed to understand how these factors interact [Fn99].

That is where “awake bruxism and stress” currently sits on the evidence: a signal of association, with no settled causal claim. Explaining an individual case with “you grind because you are under too much stress” goes beyond what this evidence can support.

4-4 The gastro-oesophageal reflux side

A systematic review (5 studies finally included) [Fn61] notes that bruxism and gastro-oesophageal reflux could have associations and act in synergy in dental wear [Fn60], that is, attacking the hard dental tissues from both a chemical (reflux) and a mechanical (bruxism) direction [Fn62].

5. Consequences (1): the tension in the evidence on “does bruxism wear teeth out”

This section has to set both sides out honestly, because the evidence does not point one way.

5-1 The gap between clinical intuition and the strength of the evidence

A study that examined this question with objective instrumentation writes directly in its background that clinically, sleep bruxism is considered to be associated with the presence of tooth wear, but that strong evidence is still lacking [Fn51].

5-2 The one finding that currently makes the comparison directly

That study recruited 63 possible sleep bruxers (19 male and 44 female) [Fn54], recorded wear on a clinical scale and then carried out one night of portable polysomnographic recording. The result: no significant correlation was found between tooth wear and the number of bruxism events per hour [Fn52]; and the presence of tooth wear was likewise not associated with self-reported parafunctions [Fn53].

Its limits have to be labelled at the same time: it is a single-centre primary study with a sample of 63 [Fn54] and a single night of recording, and it is not enough to support a settled conclusion that “bruxism has been shown not to wear teeth out”.

5-3 A larger gap in the evidence

The systematic review commissioned by the Health Technology Assessment programme of the United Kingdom's National Institute for Health Research (NIHR) included 52 randomised controlled trials [Fn37], and one of its findings deserves to be written into patient education: not one study measured tooth wear in patients with bruxism as an outcome [Fn38]. The conclusion of that review is therefore that the existing evidence is insufficient to determine whether or not splints reduce tooth wear in patients with bruxism [Fn39].

5-4 The effect on restorations and implants

The umbrella review records this in layers: bruxism might result in biomechanical complications regarding dental implants, whereas the evidence on other dental restorations and on periodontal impact remains inconclusive [Fn19]. The review of the management of awake bruxism describes the spectrum of consequences as ranging from tooth wear and fractures of dental restorations to orofacial pain related to musculoskeletal overload [Fn69].

At the implant end there are quantitative data: a systematic review and meta-analysis notes that the causal relationship between bruxism and implant failure remains controversial in the existing literature [Fn114]; its pooled odds ratio calculated per restoration was 4.72 (95% confidence interval 2.66–8.36) [Fn111] and per patient 3.83 [Fn112], the conclusion being that, in contrast to non-bruxers, prostheses in bruxers had a higher failure rate [Fn113].

⚠ Assessment of the indications for implants, their risks and their maintenance are outside the scope of this article; see domain article P01 (dental implants).

5-5 After wear has already occurred: the evidence on restoration and the conservative principle

The European expert consensus guidance (on the management of severe tooth wear) gives a clear direction: that guidance focuses on the definition of physiological versus pathological tooth wear and recommends diagnosis, prevention, counselling and monitoring as its main axes [Fn89]; management decisions are multifactorial, depending principally on the severity and effects of the wear and on the wishes of the patient [Fn90]; restorative intervention is typically better delayed as long as possible [Fn87]; and when intervention is judged to be indicated and agreed with the patient, a conservative, minimally invasive approach is recommended, complemented by supportive preventive measures [Fn88].

If restoration is genuinely needed, a systematic review provides a reference for the order of magnitude: the use of composite restorations for patients with tooth wear is considered a more conservative treatment option [Fn59]; the survival rates of anterior composites were >90% at 2.5 years and about 50% at 5 years [Fn55]. The qualifications attached to that same review matter just as much: meta-analysis could not be performed because of the heterogeneity of the included studies [Fn57], the overall strength of recommendation was graded B [Fn56], and long-term reporting of outcomes remains limited [Fn58].

Adjacent specific questions (each has its own canonical card and is not expanded here)

- How long a composite filling lasts and the variables that affect its lifespan — see canonical card KM-DENTAL-16 (in production); the complete domain map for caries and fillings is domain article P04.

- The definition, diagnosis and prognosis of cracked teeth and cracks in teeth — this round of searching obtained no systematic review addressing “the association between bruxism and cracked teeth”, so this article makes no such causal statement; the framework for managing cracked teeth is in section 4 of domain article P16 (sensitive teeth and dentine).

The portable conclusion of this section: both “bruxism is bound to wear your teeth out” and “bruxism does no harm to teeth at all” currently go beyond the evidence. What can be said with confidence is that tooth wear is multifactorial [Fn60][Fn62], and that intervention studies using wear as an outcome barely exist [Fn38].

6. Consequences (2): morning jaw soreness and headache

6-1 The part that holds up at the level of mechanism

The definition of bruxism is itself a repetitive jaw-muscle activity [Fn1], and the spectrum of consequences of awake bruxism explicitly lists orofacial pain related to musculoskeletal overload [Fn69]. In the clinical division of labour, once dentists have confirmed sleep bruxism they typically focus on mitigating oral complications such as tooth wear, on managing grinding sounds, and on addressing associated orofacial pain [Fn74].

Honest labelling: this round of searching obtained no systematic review using “the degree of jaw or masticatory-muscle soreness on waking” as an outcome measure. This article therefore provides no figure of the form “X% of people who grind wake up sore”; the above is a framework at the level of mechanism and clinical division of labour only.

6-2 The headache side has quantitative data, but they point in different directions

A systematic review of observational studies (5 included out of 544) [Fn126] found that among three tension-type headache studies there was a positive association only with awake bruxism, with an odds ratio of 5.23 (95% confidence interval 2.57 to 10.65) [Fn118]; whereas sleep bruxism showed no association with tension-type headache, and its association with migraine remains controversial [Fn119].

Three qualifications have to be set out alongside that: the certainty of the evidence in that review varied between low and very low [Fn120]; meta-analysis could not be performed because of high heterogeneity between the studies [Fn121]; and the upper multiple stated in its concluding sentence of the abstract is inconsistent with the upper bound of the confidence interval reported in its main text — this article takes the interval it reports as authoritative throughout and does not adopt the multiple stated in that concluding sentence.

6-3 Can an occlusal splint solve morning soreness

This is a fairly counter-intuitive set of findings within the field, and it is handled together in section 8 (see 8-3). The conclusion first: the current meta-analysis does not support the inference that “once a splint is worn, masticatory muscle activity will fall” [Fn46][Fn47].

Adjacent specific questions (each has its own canonical card and is not expanded here)

- Pain on biting, how to read occlusion-related pain and its possible causes — see canonical card KM-DENTAL-50 (in production).

- The grading of pain and an overview of red flags for seeking care form a separate domain; see domain article P13 (symptom triage and seeking care).

7. The boundary with temporomandibular disorders (TMD)

7-1 The two are concepts at different levels

Under the international consensus, bruxism is a jaw-muscle activity, a behaviour [Fn1][Fn6]; temporomandibular disorders are a group of disorders of the joint and the musculoskeletal structures. That is the starting point of the boundary: a behaviour is not a disease, and an association is not the same thing.

7-2 How strong the association is

A systematic review and meta-analysis (20 studies screened from 1,651 entering the meta-analysis) [Fn97] gives these results: the presence of bruxism increases the odds of temporomandibular disorders by 2.25 times [Fn91] (95% confidence interval 1.94–2.56 [Fn92]); split by type, awake bruxism increases the odds by 2.51 times [Fn93] (95% confidence interval 2.02–2.99 [Fn94]) and sleep bruxism by 2.06 times [Fn95] (95% confidence interval 1.82–2.30 [Fn96]).

The umbrella review words this more cautiously: the signs and symptoms of temporomandibular disorders present a plausible association with bruxism [Fn18]. The review of psychological factors suggests that the three of them (bruxism, temporomandibular disorders and psychological factors) are mutually entangled and that how they interact remains to be researched [Fn98][Fn99].

⚠ The three multipliers reported by the meta-analyses above are all odds ratios [Fn91][Fn93][Fn95]; an odds ratio is not causation.

7-3 The division of labour

Structural disorders of the temporomandibular joint itself (joint sounds, restricted opening, dislocation, matters relating to orthognathic surgery) are outside the scope of this article; see domain article P09 (temporomandibular joint and maxillofacial). This article deals only with the behaviour of bruxism itself and with its conceptual boundary with temporomandibular disorders.

8. Occlusal splints: what they can do and what they cannot

8-1 The higher-level conclusion first: three reviews do not point the same way

The three are not contradicting one another; they asked different questions. The umbrella review asked “relative to other therapies, which class holds up better”; the other two asked “relative to no treatment or to other therapies, can benefit be demonstrated” [Fn20][Fn33][Fn39]. “Relatively defensible among the available options” and “shown to be effective” are two different things.

The same splint review writes directly to the clinical side in its statement of clinical significance: its finding is that there is insufficient evidence to recommend occlusal splint therapy over no treatment or other treatment modalities [Fn36], and it reminds clinicians who provide such appliances to be prudent in providing treatment [Fn35].

8-2 Comparison between types

A systematic review comparing different types of occlusal splint (only 15 of 808 articles meeting the inclusion criteria) [Fn124][Fn45] notes that adjustable splints — for example full-occlusion biofeedback splints — were more effective in reducing the number of sleep bruxism episodes, in improving patient-reported symptoms and in enhancing overall well-being [Fn43]. The same review also cautions that the impact of different splints on electromyographic activity varies and that potential adverse effects should be considered individually [Fn44].

Another review, on the management of sleep bruxism in adults, gives a similar but more restrained result: oral appliance therapy tended to reduce the number of sleep bruxism events, although there was no significant difference compared with other types of splint [Fn23].

8-3 A counter-intuitive physiological finding

A systematic review and meta-analysis (12 studies included, 3 of them randomised controlled trials) [Fn50] gives this pooled result: soft and hard appliances alike did not influence the muscle activity and bite force of bruxers [Fn46], summarised as occlusal appliances not affecting the masticatory muscle function of sleep bruxers [Fn47]; the sole effect observed was a reduction in tongue force [Fn48].

The qualifications have to be set out alongside: the certainty of the evidence was judged very low for muscle activity evaluated with hard appliances and for bite force evaluated with both appliance materials [Fn49].

So “wearing a splint lets the muscles relax and the soreness is gone in the morning” is not, at present, an inference the evidence supports. In the literature the occlusal splint is described as a non-invasive, reversible management option [Fn42] — its value proposition is closer to “taking up load and observing, in a way that can be undone” than to “correcting a cause”.

8-4 “How long should a splint be worn” — this article gives no number of hours

Honest labelling of the gap: the splint literature obtained in this round of searching (umbrella review, efficacy review, NIHR assessment, review comparing types) all answer “is it effective” and “which type is better”, and not one of them uses “how many hours a day” or “for how many weeks or months” as an outcome measure. This article therefore provides no figure for wearing time or length of treatment; frequency and duration of wear are matters of individual clinical judgement and have to be decided by a dentist according to the indications, the type of appliance and the results of follow-up.

The one thing that can be said on the evidence side is this: the existing studies generally call for more rigorous, larger-sample, longer-follow-up randomised controlled trials to clarify the efficacy and safety of management [Fn26][Fn32].

9. Where other approaches sit on the evidence spectrum (not recommendations, not medication instructions)

• Behavioural approaches: the review of the management of awake bruxism (9 studies with 165 participants, screened from 4,358 abstracts) [Fn125][Fn70] notes that although the included studies varied in risk of bias, they generally suggested positive effects of biofeedback, guided music listening, habit reversal, reminder prompts and counselling with self-management [Fn71]; meta-analysis was not carried out because of the high heterogeneity between studies [Fn73]; and its conclusion is that the available evidence is limited but still suggests benefits of a behavioural approach for the frequency and consequences of awake bruxism [Fn72]. The same review states explicitly that no official guidelines currently exist on the management of awake bruxism [Fn67].
• Cognitive behavioural therapy (sleep bruxism): the reading given by the review of the management of sleep bruxism in adults is that its potential benefits were not well supported [Fn24].
• Pharmacological and injection-type interventions: the same review records that some interventions of this kind showed significant reductions in specific sleep bruxism parameters, while several side effects were reported at the same time [Fn25]. Another meta-analysis of injection-type interventions included 6 studies with 148 participants [Fn109], and its authors label plainly that whether bruxism events recur or rebound after injection needs more follow-up clinical evidence [Fn110].

⚠ This article lists the name of no prescription medicine or injectable product, makes no statement about their effect and gives no medication instruction; interventions of this kind fall within the scope of a doctor's prescription, and whether they are applicable, their risks and the alternatives must be assessed by a doctor face to face. What is recorded here is only the state of the evidence — that this route has been studied and that the long-term data remain insufficient [Fn109][Fn110].

• The higher-level judgement overall: a 2025 systematic review and meta-analysis (22 studies suitable for data extraction) [Fn30] concludes that there is no single treatment that is universally effective for all patients [Fn28]; that a multidisciplinary approach combining different therapies may yield better results [Fn29]; that the effectiveness of appliances varies depending on design and material [Fn31]; and that further long-term, methodologically rigorous studies are still needed to evaluate the durability of the therapeutic effect [Fn32].

10. Occlusal adjustment: why it has to be conservative (this section is the centre of gravity of this article)

10-1 Defining the action first

The 2024 Cochrane review delimits “occlusal interventions” thus: occlusal interventions include splints and adjustments [Fn84]; and occlusal adjustment is the grinding down of teeth to improve occlusion [Fn79].

That definition in itself explains the reason for the conservative principle: tooth substance that has been ground away does not grow back. An occlusal splint is reversible [Fn42]; occlusal adjustment is not.

10-2 What the current Cochrane review says

The same Cochrane review included 57 studies with 2,846 participants, comparing occlusal splints with no treatment, placebo or another treatment [Fn80]; only one of them was judged to be at low risk of bias [Fn83]; the certainty of the evidence was judged very low for all outcomes in all comparisons, because of limitations in study design and imprecision [Fn82]; and the overall conclusion is that the evidence is insufficient to reach conclusions regarding the effectiveness of occlusal interventions for managing the symptoms of temporomandibular disorders [Fn81].

One point about how to read it deserves particular attention: the 57 studies included in that review all compared occlusal splints [Fn80] — which is to say that even when the scope is widened to “occlusal interventions”, the available clinical-trial evidence is almost entirely concentrated at the reversible end.

10-3 A record of the evidence gap left by a withdrawn publication

The frequently cited Cochrane review *Occlusal adjustment for treating and preventing temporomandibular joint disorders* has had its 2016 version withdrawn: the withdrawal statement records that the review is out of date and does not meet current Cochrane methodological standards [Fn85], and that it will be superseded by a new Cochrane review on occlusal interventions for managing temporomandibular disorders [Fn86].

Under the citation-grade rule of this line, a withdrawn publication cannot serve as peer_reviewed medical evidence, and this article records it only as an evidence gap; its original conclusions are not among the citations of this article. What this entry means is: if you read online that “Cochrane says occlusal adjustment does not work”, the version that citation points to has been withdrawn; the current state is that high-quality randomised controlled trial evidence on occlusal adjustment itself does not form the bulk of the studies included in the current version of the Cochrane review [Fn80].

10-4 How the conservative principle is derived

Joining the above together yields three principles that require no additional assumptions:

1. Reversible before irreversible: the literature describes the occlusal splint as a non-invasive, reversible option [Fn42], whereas occlusal adjustment removes tooth substance [Fn79]. Where the certainty of the evidence is very low [Fn82], choose the one you can come back from first.
2. Diagnose first, manage afterwards, and do not classify people with cut-off points: the consensus states plainly that standard cut-off points should not be used to establish the presence or absence of bruxism in healthy individuals [Fn8], and that in healthy individuals bruxism is regarded as a behaviour rather than a disorder [Fn6]. Applying an irreversible structural intervention to a “behaviour” should require a higher threshold.
3. The management of wear itself argues for delay and minimal invasiveness: the European consensus guidance holds that restorative intervention is typically better delayed as long as possible [Fn87], that where it is needed a conservative, minimally invasive route complemented by preventive measures should be taken [Fn88], and that the decision depends on severity, effects and the patient's wishes [Fn90].

⚠ This section explains principles at the level of the evidence; it is not management advice for any individual case. Whether any form of occlusal intervention is needed has to be judged by a dentist on the basis of a complete examination.

11. What costs are made of (no amounts of any kind)

This article provides no price, fee or coverage information. This section only sets out the structural factors that drive cost.

1. The level of assessment: assessment can fall at any of the three levels of self-report, clinical examination or device-based [Fn7][Fn12], and instrument-level sleep investigation is explicitly described in the literature as extremely expensive and time-consuming [Fn116]. The higher the level, the more examination is involved.
2. The type and design of the appliance: different types of occlusal splint differ in their effects and adverse effects [Fn43][Fn44], and the therapeutic effect varies with design and material [Fn31] — that is where differences in appliance cost come from.
3. Whether more than one discipline is needed: sleep bruxism is more prevalent in several populations with sleep disorders [Fn101], and that review calls for more screening [Fn104]; where collaboration with the sleep-medicine side is needed, the care involved is different.
4. Follow-up and remaking: the existing studies are generally short to medium term and call for longer follow-up [Fn26][Fn32]; this means that management often requires repeated assessment rather than being closed out in one go.
5. Whether a restorative stage is entered: the principle for restorative intervention is to delay as long as possible and to be conservative and minimally invasive [Fn87][Fn88]; once restoration is entered, the survival data for anterior composites showing about 50% at 5 years [Fn55] mean that the possibility of subsequent maintenance and remaking has to be counted in.

Local fee arrangements, insurance and the boundaries of coverage are outside the scope of this article: for local systems and costs see the corresponding canonical card (TW) and domain article P12 (the complete guide to costs and insurance systems).

12. Signals for seeking care (conceptual level; this article compiles no symptom grading table)

This article labels its scope honestly: symptom grading and red-flag criteria form a separate domain, taken up by P13 (symptom triage and seeking care), and this article does not compile a symptom table of its own.

The literature of this field supports only three conceptual signals:

1. Self-assessment has a structural ceiling — awareness of tooth grinding is highly unlikely to be a valid indicator of true sleep bruxism [Fn115], and the consensus opposes using standard cut-off points to establish presence or absence [Fn8]. So neither “I think I do” nor “I think I don't” is a reliable basis for action.
2. Once consequences appear, they are a clinical problem that can be assessed — the spectrum of consequences covers tooth wear, fractures of dental restorations and orofacial pain related to musculoskeletal overload [Fn69], and those are exactly what dentists focus on once sleep bruxism has been confirmed [Fn74].
3. Where other sleep problems coexist, screening should cover both — sleep bruxism is more prevalent in several populations with sleep disorders [Fn101], and the literature explicitly calls for more screening [Fn104].

So the one piece of advice the domain level can give is this: when observable consequences appear (wear, damaged restorations, persistent jaw and facial pain), or when other sleep problems are present at the same time, the correct next step is a clinical assessment, not judging for yourself or buying an appliance for yourself.

13. Risk factors (indications / adverse effects / contraindications and limits)

Indications (at the level of the literature, not advice for any individual case)

• Any discussion of management presupposes that assessment and grading have been completed, and assessment divides into the three levels of self-report, clinical examination and device-based [Fn7][Fn12], with the degree of confidence expressed as “possible / probable / definite” [Fn4].
• In otherwise healthy individuals, bruxism is regarded by the international consensus as a behaviour rather than a disorder [Fn6] — which means that “having bruxism” does not in itself automatically constitute an indication for management.
• Occlusal appliances are listed in the umbrella review among the few approaches considered effective [Fn20][Fn21], but another review in the same field holds that the evidence is insufficient to determine that they are superior to no treatment [Fn33]; the two have to be set out together.
• Judging the indication for restorative intervention depends on the severity and effects of the wear and on the patient's wishes, and the principle is to delay as long as possible [Fn90][Fn87].

Possible adverse effects and unwanted outcomes

• Appliance-related: the impact of different occlusal splints on electromyographic activity varies, and potential adverse effects should be considered individually [Fn44]. In the systematic review of 52 RCTs [Fn37], adverse events were generally not reported, and seemed infrequent when they were [Fn40] — “reported rarely” is not the same as “absent”; it only means this aspect has been under-studied.
• Pharmacological and injection-type interventions: the literature records that interventions of this kind produced significant reductions in specific bruxism parameters while several side effects were reported [Fn25]; and whether recurrence or rebound follows injection-type intervention still needs more follow-up evidence [Fn110]. This article lists no product name, makes no statement about effect and gives no medication instruction.
• Irreversible management: occlusal adjustment is the act of removing tooth substance [Fn79]; it does not form the bulk of the clinical-trial evidence in the current Cochrane review [Fn80], and the certainty of the evidence for occlusal interventions as a whole was judged very low [Fn82].
• The restoration end: bruxism might result in biomechanical complications regarding implants [Fn19]; prostheses in bruxers had a comparatively higher failure rate [Fn113], although the causal relationship remains controversial in the literature [Fn114].

Contraindications and limits of applicability (the ceiling of the evidence)

• No universal solution: there is no single treatment that is universally effective for all patients [Fn28].
• No official guideline (awake bruxism): no official guidelines currently exist on the management of awake bruxism [Fn67].
• Limits on the quality of the evidence: in the splint efficacy review, the studies in every comparison carried a medium to high risk of bias [Fn35]; the evidence identified in the NIHR assessment was of very low quality [Fn41]; the certainty for all comparisons and outcomes in Cochrane 2024 was very low [Fn82]; the certainty in the meta-analysis of masticatory muscle function was likewise very low [Fn49]; and the certainty in the review of headache associations varied between low and very low [Fn120].
• Design limits: the prevalence figures and associated factors cited in this article come mostly from observational or cross-sectional studies, which can show association only and cannot support causal inference; the studies included in the meta-analysis of the temporomandibular disorder association are likewise observational [Fn97].
• Sample limits: the tooth-wear comparison study had only 63 participants at a single centre [Fn54]; the review of the management of awake bruxism had only 9 studies with 165 participants [Fn70]; the meta-analysis of injection-type intervention had only 6 studies with 148 participants [Fn109]; the review of psychological factors was a qualitative analysis of only 10 studies [Fn100].
• Limits of geographical coverage: the global prevalence review states of itself that it could not analyse Africa and Australia [Fn108].
• This article contains no self-management, medication, dose or procedural instruction of any kind; nor does it provide any splint wearing time or length of treatment.

⚠ This section is a disclosure of medical risk and does not constitute treatment advice for any individual. Actual treatment approaches and outcomes vary from person to person and must be assessed by a dentist.

Every clinical statement in this article is mapped line by line to its cited source (see the sources and evidence chain below). It has not been clinically reviewed by a licensed practitioner. This is health information, not individual advice; assessment by a clinician is required.