The Complete Guide to Sensitive Teeth and Dentine: a domain map from mechanism through differential diagnosis to the evidence spectrum of management

The Complete Guide to Sensitive Teeth and Dentine: a domain map from mechanism through differential diagnosis to the evidence spectrum of management

TL;DR

The precondition for sensitivity is that dentine is exposed to the oral environment [Fn2], and the mainstream explanation of the pain is fluid movement within dentine [Fn1]; its symptoms resemble those of several other conditions, so clinical differentiation is required [Fn3].

(Measured on the Chinese original with Python `len()` after the [Fn] markers are removed: 50 characters including punctuation, 46 characters excluding punctuation, both within the threshold of 60 characters or fewer; see item 6 of the Self-check record.)

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 "why does this tooth of mine ache". A question of individual diagnosis like that can be answered only by the dentist who has examined that tooth. What this article handles is the gap at domain level: how this symptom arises physiologically, which axes the professional community uses to describe it, which conditions it resembles and therefore has to be told apart from, what kind of evidence spectrum the available management options form, and why those frequently quoted percentages fail to line up with one another.

One thing has to be said clearly first, because it governs how every later paragraph is to be read: in this domain, "dentine hypersensitivity" is a judgement that can stand only after other causes have been excluded [Fn3], and the literature has to this day no universally accepted guideline for differential diagnosis or for the selection of treatment [Fn4]. What this article offers is therefore a map for reading, not a tool for self-diagnosis.

1. Physiological background: what happens after dentine is exposed

1-1 The precondition is exposure

The starting point of this symptom is not that the tooth has grown fragile, but that dentine is exposed to the oral environment [Fn2]. The factors related to exposure that show a significant association in the literature include erosive tooth wear and gingival recession [Fn11], as well as non-carious cervical lesions [Fn14]; the stimuli used in clinical studies to provoke the symptom are typified by the cold test and the evaporative (air-blast) test [Fn9].

1-2 The mainstream mechanism: fluid movement

As to why iced water stings the moment it touches the tooth, the explanation currently accepted widely is the hydrodynamic theory — fluid movement inside the dentinal tubules is regarded as the principal cause of the pain [Fn1]. But the same review states in as many words that the neurosensory mechanisms underlying this symptom remain unclear to this day [Fn89] — "widely accepted" is not the same as having been proven to be a single mechanism.

1-3 But there is more than one mechanism

A review of mechanisms sets out five proposed mechanisms of dentinal sensitivity [Fn5] and states explicitly that these theories are not mutually exclusive [Fn6]. Two extensions matter more: pulpal responses to tissue injury may alter the relative contribution of each of these mechanisms [Fn7], and pulpal inflammation may lead to neuronal sprouting and peripheral sensitisation [Fn8].

These two sentences are the physiological basis of the later section on "when it is no longer just sensitivity": when the pulp changes state through tissue injury or inflammation, the relative contribution of each mechanism may change with it [Fn7], and neuronal sprouting and peripheral sensitisation may appear [Fn8]. The modality of the source wording is "may", and its direction is "the state of the pulp changes → the contribution of the mechanisms may change"; it must not be read backwards as "the symptom has changed, therefore the mechanism has changed".

1-4 Why "cold" is the typical trigger

In a cross-sectional study of Turkish adults (259 women and 209 men, aged 18–72) [Fn92], the sensitivity provoked by the cold stimulus was greater than that provoked by the evaporative (air-blast) stimulus [Fn9]; note that the percentages in that study take teeth as the denominator, 12,048 teeth having been analysed in all [Fn93]. And in the network meta-analysis of desensitising ingredients, cold stimulus is listed separately as one outcome measure, with its effect size and confidence interval reported on their own (CSP against the fluoride comparator: 3.93, 95% confidence interval 0.34–7.53, the lower bound close to zero) [Fn10] — which shows that "cold" is handled as a separate dimension within the methodology of the research itself, and is not an illusion of the patient's.

2. Exposure pathways: why dentine comes to be exposed

2-1 The associations the literature confirms

In a cross-sectional study spanning seven European countries, dentine hypersensitivity was statistically significantly associated with erosive tooth wear and with gingival recession [Fn11]. The cross-sectional study of Turkish adults mentioned above lists cold air, the consumption of sweet food, the presence of non-carious cervical lesions and gingival recession as significant risk indicators [Fn14]. And within that same seven-country study (not the Turkish one), a significant association also appears between sensitivity and heartburn, the symptom of gastric reflux [Fn15].

2-2 A common misunderstanding: brushing is not a single cause

The consensus report of the European Workshop on Periodontology records it plainly: there is no direct evidence to confirm tooth brushing as the sole factor causing gingival recession or non-carious cervical lesions [Fn12]; local factors and factors belonging to the patient can be highly relevant in the development and progression of these lesions [Fn13].

This matters in health education: laying the whole of the blame on "you brush too hard" does not fit the evidence, and it also allows the causes that really operate — the source of acid, the occlusion, the periodontal condition — to be overlooked. As an observational pointer in the same direction, in the seven-country study mentioned above the users of a powered toothbrush showed lower proportions of sensitivity, of wear and of gingival bleeding [Fn16] — but that is a cross-sectional association and must not be read as causation.

Concrete questions adjacent to this domain (each has its own canonical card; this article does not expand them)

- The causes of gingival recession, whether it can be reversed, and the management options — see canonical card KM-DENTAL-27 (in production); the triage, the recovery and the verification framework of soft-tissue grafting ("gum grafting") surgery itself are carried by a separate canonical card, KM-DENTAL-14, and this article expands neither of them.

- The complete framework of periodontal health and its maintenance — see pillar article P05 (Periodontics and the gums).

3. Prevalence: why the figures you see fail to line up

This is a passage that is very easily misread in this domain, so it is handled on its own.

Neither figure is wrong, but the two do not measure the same thing: one is a population proportion quoted in a literature overview, the other is the proportion measured with a clinical scale in 3,551 adults of a mean age of 44 [Fn19]. The authors of that study note it themselves: the prevalence observed on this occasion was higher than in most of the existing literature [Fn21]. Within the same study, wear (BEWE ≥ 1) reached 97.6% and gingival recession (≥1 mm) reached 87.9% [Fn28] — measure with one and the same strict criterion and almost everybody will be judged to "have a bit of it".

There is one more counter-intuitive observation: the prevalence of sensitivity begins to decline after about the ages of 38–47 [Fn20]. And in the Turkish study mentioned above, the proportion of incisors affected was higher than that of molars [Fn22] — that proportion takes teeth as its denominator [Fn93] and comes from a single-country sample [Fn92], so it must not be generalised into a universal distribution by tooth position.

A portable way of reading this: whenever you meet a prevalence figure, ask first "measured by what criterion, and measured on whom". The two figures in this table are nearly nineteen percentage points apart (57% is the upper bound quoted in an overview [Fn17], 75.9% is the value measured with a clinical scale [Fn18]); this is not a contradiction but a difference of definition and of measurement.

4. The differential framework: sensitivity is the judgement that remains after other causes are excluded

4-1 Why you cannot judge it for yourself

Several dental conditions produce symptoms resembling dentine hypersensitivity at different stages of their progression, which makes diagnosis and treatment frequently confusing [Fn3]. The literature states at the same time that this domain has to this day no universally accepted guideline for differential diagnosis or for the selection of reliable treatment modalities [Fn4].

This is not a theoretical worry. The nationwide survey carried out among 3,000 dentists in December 2020 by the Indian Society of Periodontology [Fn95] disclosed knowledge gaps that include under-diagnosis, incorrect differential diagnosis, and problems in the strategy of management [Fn23] — note that this is the result of a survey of dentists in one country, India, and must not be extrapolated into a picture of clinical practice worldwide. The Canadian consensus document likewise gives the lack of clear and robust evidence in the dental literature, together with confusion about diagnosis and management, as the reason the consensus was drawn up at the time [Fn85], and points out that a high prevalence of the condition, under-diagnosis, and the widespread availability of non-invasive, efficacious and inexpensive preventive treatment together form the background against which directional guidance is needed [Fn84].

4-2 What the professional side does

• The five elements of diagnosis: a differential-diagnosis review sets out that an oral screening for sensitivity should cover the patient history, a clinical examination including radiographs, a variety of tests, the identification of risk factors, and a differential diagnosis [Fn24].
• An algorithm: the Canadian consensus established a simple algorithm to guide clinicians through the diagnostic process [Fn25].
• A decision threshold: the consensus report of the ATASIO expert panel produced a clinical decision threshold by the RAND method [Fn26], and the same document says outright that before that consensus the treatment options to be provided, their prognosis and their timing had never been defined [Fn65].
• Routine screening: the Indian Society of Periodontology recommends routine screening of all dentate patients for areas of exposed dentine and for sensitivity, so that under-diagnosis is avoided [Fn27], and has for the first time put forward a system for classifying sensitivity patients that is based on specific case definitions [Fn86].

Put differently, the professional effort of nearly two decades in this domain has gone mainly into standardising the diagnostic process first, rather than into finding one universal therapy.

4-3 Where the line runs against caries

An honest sentence first: there is at present no systematic review that can be cited whose outcome measure is the accuracy, at patient level, of differentiating sensitivity from caries. This article can therefore give a framework only, and no proportion.

The framework has three lines:

1. Similar symptoms do not mean an identical cause — several conditions mimic the symptoms of sensitivity at different stages [Fn3].
2. Correct judgement requires radiographs and multiple tests [Fn24], and these are the part that self-observation cannot replace.
3. Epidemiologically, the significant associations reported by the seven-country study mentioned above are with wear and with gingival recession [Fn11]; that abstract does not report an association between sensitivity and caries, so it cannot be inferred in reverse that "sensitivity has nothing to do with caries" — not reported is not the same as not associated.

Adjacent concrete questions (each has its own canonical card; this article does not expand them)

- Whether a decayed tooth must always be filled, the threshold being whether the lesion can still be controlled — see canonical card KM-DENTAL-12 (in production).

- "How long can a decayed tooth be left" has no answer in days, only dividing signals — see canonical card KM-DENTAL-15 (in production).

- The complete domain map of caries and fillings — see pillar article P04 (Tooth decay and fillings).

4-4 Where the line runs against a cracked tooth

A cracked tooth is another entity that has to be judged apart from sensitivity — several dental conditions produce symptoms resembling sensitivity at different stages of their progression [Fn3]. The literature defines a cracked tooth as an incomplete fracture that starts from the crown and progresses in a subgingival direction [Fn29]. What makes it hard to handle is that the extent to which the crack reaches is unknown, which makes diagnosis and management difficult [Fn30].

This topic already has a statement at official level: the position statement put forward by an expert committee convened by the European Society of Endodontology (ESE) [Fn31] covers the aetiology, the clinical presentation and the management of cracks and fractures that manifest along the long axis of the crown and/or the root [Fn32]. At the same time, a narrative review points out that no consensus has yet formed in the literature on the restorative and endodontic management of cracked teeth [Fn33].

Two directions are on record: cracked teeth with a normal pulp or with reversible pulpitis have exhibited higher pulp and tooth survival rates after direct or indirect composite resin restoration [Fn34]; and in the absence of symptoms or of compromised tooth structure, recent data favour monitoring [Fn35]. As to prognosis, one review records the chance of survival at five years for a restored cracked tooth as 74.1–96.8% [Fn36] — note that this is a very wide range, that it comes from a narrative review rather than a meta-analysis, and that it can serve as an idea of the order of magnitude only, and not as a prediction for an individual.

An adjacent concrete question (it has its own canonical card; this article does not expand it)

- How to read pain related to biting, of the kind that hurts on biting and hurts more on release — see canonical card KM-DENTAL-50 (in production).

4-5 Where the line runs against a change in the state of the pulp

The section on mechanism above supplies the basis for reading this: pulpal responses to injury may alter the relative contribution of each mechanism [Fn7], and pulpal inflammation may lead to neuronal sprouting and peripheral sensitisation [Fn8].

So when the pattern of the symptoms changes, it should not be construed on one's own as "the sensitivity has worsened": once the state of the pulp changes, the relative contribution of the mechanisms may itself be different [Fn7][Fn8]; and telling which of the situations applies needs the complete process of history-taking, a clinical examination including radiographs, and multiple tests [Fn24] — precisely the part that self-observation cannot replace.

This article compiles no symptom grading table and no red-flag list: symptom grading and the red flags for seeking care are an independent domain, carried by P13 (Symptom grading and a guide to seeking care) and by the related canonical cards. How dental pain is to be read and handled at the moment it occurs is set out in canonical card KM-DENTAL-33 (in production).

5. The evidence spectrum of management (1): the at-home layer

5-1 Two lines of action, and no more

The consensus report of the European Workshop on Periodontology reduces the mechanisms of treatment to two: occlusion of the dentinal tubules, and modification or blocking of the pulpal nerve response [Fn37]. Most desensitising agents lower the symptom by occluding patent dentinal tubules [Fn38].

This axis of classification explains why the ingredients on the market look so miscellaneous: the consensus report describes the treatment of dentine hypersensitivity by these two modes of action [Fn37], not by sorting ingredient names one at a time.

5-2 Where the ladder of management starts

The recommendations of the Indian Society of Periodontology design management as a ladder: active management should be accomplished by a combination of at-home and in-office therapies, starting from the simpler and cost-effective at-home use of desensitising toothpastes [Fn40].

5-3 Evidence at the level of ingredients (no brand is involved)

The key information in this table is not which ingredient comes out on top, but that two reviews reach conclusions pointing in different directions on strontium [Fn47][Fn48] — and the classes judged to carry low-quality evidence fall exactly on that dispute [Fn91]. This is not somebody having made a mistake; it follows from differences of inclusion criteria, of comparison group and of outcome measure. The network meta-analysis of 2023 therefore calls explicitly for a standardised methodology guideline to be developed [Fn53].

5-4 The ceiling of certainty of this spectrum

The same systematic review of the European workshop included 11 agents and 105 randomised controlled trials [Fn50], yet because the heterogeneity between studies was too high and direct comparisons were lacking, the data were insufficient to undertake a meta-analysis [Fn51], and the existing evidence for each agent could be presented narratively only. That review states at its very outset that the gold standard treatment modality for dentine hypersensitivity has not yet been established [Fn52].

And what needs to be understood more at the patient's end is this: what most desensitising agents deal with is the symptom (occluding the tubules) [Fn38], and the long-term outcome of treatment of that kind is uncertain [Fn39].

⚠ What this section states are conclusions in the literature at the level of ingredients. It is not a product recommendation, and it does not constitute any instruction for self-management. Toothpaste is an ordinary product for oral cleaning and cannot replace a diagnosis; whether it applies, and which class of it, has to be assessed by a dentist on the basis of the differential diagnosis.

6. The evidence spectrum of management (2): the in-office layer

6-1 Professionally applied agents

• Prophylaxis pastes: professionally applied prophylaxis pastes containing arginine and CSP show efficacy [Fn54].
• High-concentration CSP paste: a prophylaxis paste containing 15% calcium sodium phosphosilicate was favoured over the negative control in reducing hypersensitivity after periodontal therapy, although the grade of the evidence was rated low [Fn55].
• Bioactive glass: a systematic review included 30 studies, all of them assessed as at low risk of bias except one [Fn56], covering the pain responses of 2,845 patients aged 17 to 75 [Fn57], and concluded that a bioactive-glass-based agent used in office or at home can lower the sensitivity response in the immediate, medium or long term up to 12 weeks [Fn58], its long-term efficacy being similar to that of other agents [Fn59].

6-2 Lasers

A systematic review and meta-analysis included 34 studies, 11 of which entered the quantitative analysis [Fn60], and concluded that whichever type of laser is used, it is an effective option for controlling the pain symptoms [Fn61]. The evidential structure of that conclusion has to be read along with it: of the 34 studies only 11 entered the quantitative analysis [Fn60], and what that meta-analysis compared was the average pain before treatment against the average pain after 3 months of treatment [Fn94] — a within-group comparison of before and after, not a comparison against a control group, so it cannot separate a placebo effect from natural variation. The same analysis also points out that because the methods of assessment differ too greatly from one study to another, no defined treatment protocol could be established [Fn62], and that most of the studies followed patients up for a maximum of 6 months [Fn63].

6-3 The limits shared across the in-office layer

The systematic review of the European workshop writes it out directly: there is limited evidence to confirm the relative effectiveness of individual professionally applied agents [Fn64]. And the ATASIO consensus document records that before that consensus was produced, the treatment options, their prognosis and their timing had never been defined [Fn65], and argues that a consensually validated protocol for management has to be considered mandatory by all dental professionals [Fn66].

The portable conclusion: the evidence spectrum of in-office management is strong in that "most methods show a fall in pain within a short observation window", and weak in that "there is no standard protocol [Fn62], long-term and directly comparative data are lacking [Fn63][Fn64], and part of the conclusions rest on within-group comparisons of before and after [Fn94]". Any claim that one particular in-office treatment is superior to the others goes beyond what the present evidence can carry.

7. The soreness that follows a scaling or periodontal treatment

This section explains why "my teeth became sensitive after the scaling" is, in the literature, no accident.

The remit reviewed by the consensus report of group 4 of the European Workshop on Periodontology itself included the item of managing hypersensitivity through professionally and self-administered agents [Fn67] — which is to say that within the framework of that workshop, the management of sensitivity is a topic discussed together with the complications of preventive measures such as professional mechanical cleaning (scaling, root planing).

On the evidence side there are two items:

• A professional prophylaxis paste containing 15% CSP is superior to the negative control in reducing hypersensitivity after periodontal therapy, at a low grade of evidence [Fn55]; the same review stresses at the same time that because strong evidence is scarce, high-quality, well-designed clinical trials are still required in the future before a clear recommendation can be made [Fn71].
• A randomised controlled trial recruited 75 patients who reported hypersensitivity after scaling and root planing [Fn68], assessed them at six time points with verbal and visual rating scales [Fn69], and compared three rinse regimens; the result was that two of the groups were equivalent [Fn88] and superior to warm saline rinses [Fn70].

The purpose of listing the latter is to show that "sensitivity after periodontal treatment" is already studied as a clinical problem open to intervention; it is not to offer any scheme of self-management.

An honestly flagged gap: this round of searching did not obtain a systematic review whose outcome measure is "how many days or how many weeks until it settles", and this article therefore gives no figure in days. How long it lasts, and whether it needs treatment, are matters of individual clinical judgement.

An adjacent concrete question (it has its own canonical card; this article does not expand it)

- The interval between scalings and whether they are necessary — see canonical card KM-DENTAL-43 (in production); for the complete framework at the preventive end see pillar article P11, and at the periodontal end P05.

8. Sensitivity after whitening

8-1 This is a known phenomenon with a mechanistic explanation

The background statement of one meta-analysis says it directly: in-office whitening results in a high risk of tooth sensitivity, and the cause of it is the inflammatory process of the pulpal tissue [Fn72]. This agrees with what the section on mechanism set out above — when what lies underneath becomes an inflammatory response, the character and the duration of the symptom may differ from a pain of simple fluid movement [Fn7][Fn8].

8-2 The relation between dose and risk (a question-layer topic; this article gives one summary sentence only)

The relation between the concentration used in at-home whitening and the risk of sensitivity is part of the question-layer topic "methods of whitening", and under the iron rule of this layer it is not expanded here: the one-sentence summary is that a high concentration increases the risk and the intensity of sensitivity [Fn75], that on average the intensity is mild [Fn76], and that the analysis itself states its quality of evidence to be low [Fn77].

The concentration tiers of each whitening route, the comparison between the regimens, and a full account of the effects and side effects are set out in canonical card KM-DENTAL-19 (in production); this article does not repeat its content.

Another variable is the contact time: a systematic review and meta-analysis found that shortening the time for which an at-home whitening gel is used significantly reduces events of sensitivity [Fn79], but the same study warns that shortening the exposure time should be applied with caution in clinical practice [Fn80] — because most of the parameters for assessing the change of colour perform better when the gel is used for the recommended time. This is a trade-off, not an optimisation running one way.

8-3 The evidential gap for desensitising strategies in the whitening setting

Do not carry the at-home evidence of section 5 straight across. A systematic review included 5 studies and 387 individuals undergoing in-office or at-home whitening [Fn81] and concluded that desensitising toothpastes show an effect in at-home whitening with high-concentration carbamide peroxide and in single-session in-office whitening with highly concentrated hydrogen peroxide, but show no effect in at-home whitening with low-concentration carbamide peroxide or in in-office whitening over two sessions [Fn82]. In other words: one and the same toothpaste does not perform consistently across different whitening regimens.

As for drug prophylaxis, the conclusion of one meta-analysis is that the high level of evidence available does not support the administration of anti-inflammatory and analgesic drugs to prevent the sensitivity caused by in-office whitening [Fn83]. This article cites that conclusion solely to show that "this route has been studied and has not been supported"; this article gives no instruction on medication, and any use of a drug has to be decided by a doctor or a dentist.

An adjacent concrete question (it has its own canonical card; this article does not expand it)

- The classification of whitening methods, their procedures and their respective limits — see canonical card KM-DENTAL-19 (in production); for the complete domain map of cosmetic dentistry see pillar article P10.

9. What a cost is made of (no monetary amount is given)

This article provides no price, charge or reimbursement information. This section explains only which structural factors drive a cost.

1. The level of management: the design of management recommended in the literature is a ladder, starting from the simpler and cost-effective at-home desensitising toothpaste and then combining in-office therapy as the situation requires [Fn40]. The higher the level, the more clinical acts are involved, and this is one of the sources of differences in cost.
2. The diagnosis itself: correct judgement requires the patient history, a clinical examination including radiographs, and multiple tests [Fn24], and this is a necessary procedure rather than an optional extra.
3. Repetition and follow-up: the evidence for in-office management mostly has a short-to-medium observation window — in the laser studies most follow-up periods have a ceiling of 6 months [Fn63], and the evidence for bioactive glass covers a window up to 12 weeks [Fn58]. This means that management often needs repeated assessment rather than closing after a single visit.
4. Whether the cause has been dealt with: most desensitising agents act at the symptom end [Fn38] and their long-term outcome is uncertain [Fn39]; if the causes of the exposure — wear, recession, exposure to acid — persist [Fn11][Fn14], the number of subsequent episodes of care will differ.

Local systems of charging, insurance and the boundaries of reimbursement fall outside the scope of this article: for local systems and costs see the corresponding canonical card (TW) and pillar article P12 (The complete guide to costs and insurance systems).

10. An overview of the signals for seeking care (this article compiles no symptom list)

This article marks its scope honestly: symptom grading and red-flag criteria form an independent domain, carried by P13 (Symptom grading and a guide to seeking care), and this article compiles no symptom table of its own.

The literature of this domain supports three conceptual signals only:

1. Self-judgement has a structural limit — several conditions mimic the symptoms of sensitivity [Fn3], and within the domain there is to this day no universally accepted guideline for differential diagnosis [Fn4].
2. The extent of a crack cannot be judged from the outside — the difficulty of diagnosing and managing a cracked tooth comes precisely from the unknown extent of the crack [Fn30].
3. Under-diagnosis has been recorded in a survey that was actually carried out — the nationwide survey of 3,000 dentists conducted by the Indian Society of Periodontology in December 2020 [Fn95] disclosed gaps that include under-diagnosis and incorrect differential diagnosis [Fn23], and this is also the reason that society recommends routine screening of all dentate patients for exposed dentine and for sensitivity [Fn27]. This is a survey in a single country, India, and must not be extrapolated into a picture of clinical practice worldwide; this article uses it only to show that "under-diagnosis is a risk that has been recorded", and does not use it to estimate any proportion.

The advice the domain layer can give therefore amounts to one sentence only: when a symptom is present, changes, or affects eating, the correct next step is a clinical examination that includes radiographs and multiple tests [Fn24], rather than a prolongation of self-observation.

11. Risk factors (indications / side effects / contraindications and limits)

Indications

• The precondition for desensitising treatment is that a differential diagnosis has first confirmed the symptom to come from exposed dentine [Fn2][Fn24] and not from another condition [Fn3].
• In the order of management, the literature recommends starting at the at-home layer and then combining it with in-office therapy [Fn40].
• The society recommends routine screening of all dentate patients for exposed dentine and for sensitivity, so that under-diagnosis is avoided [Fn27].

Possible side effects and adverse outcomes

• Sensitivity related to whitening: one meta-analysis records in its background statement that in-office whitening results in a high risk of sensitivity, the cause being the inflammatory process of the pulpal tissue [Fn72] (what that analysis itself assessed was whether anti-inflammatory and analgesic drugs can prevent this sensitivity [Fn83]; verifying that mechanism was not the purpose of the research, so this sentence is a background statement and not its own empirical conclusion); in at-home whitening a high concentration increases the risk and the intensity of sensitivity [Fn75], though the average intensity is mild [Fn76].
• Sensitivity after periodontal treatment: sensitivity after scaling and root planing is a phenomenon that has been taken into clinical-trial research [Fn68], and one that the workshop places among the topics related to preventive measures and discusses together with them [Fn67].
• Data on the adverse reactions of the agents themselves are scarce: in the CSP-specific meta-analysis, only two studies reported side effects of use [Fn87] — scarce data are not the same as safety; they mean only that this aspect is under-researched.
• The risk of a symptom being masked: most desensitising agents act at the symptom end by occluding the tubules [Fn38]; if the cause is not identified, relief of the symptom may delay a correct diagnosis — and under-diagnosis and incorrect differentiation have been recorded in the nationwide survey of dentists in India [Fn95][Fn23].

Contraindications and limits of application

• The ceiling of the evidence: the gold standard treatment modality has not yet been established [Fn52]; the data on 11 agents and 105 RCTs are still insufficient to undertake a meta-analytic comparison [Fn51]; the evidence confirming the relative effectiveness of individual professionally applied agents is limited [Fn64].
• Long-term data are insufficient: the long-term outcome of desensitising treatment is uncertain [Fn39]; most of the laser studies have a follow-up ceiling of 6 months [Fn63], no defined protocol could be established [Fn62], and their meta-analysis was a within-group comparison of before and after [Fn94]; the evidence window for bioactive glass reaches 12 weeks [Fn58].
• Limits on the quality of evidence: the quality of evidence in the whitening-related network meta-analysis is low [Fn77] and most of the included studies were at high risk of bias [Fn78]; the grade of evidence for 15% CSP against sensitivity after periodontal therapy is low [Fn55], and that review also stresses that strong evidence is scarce [Fn71].
• The conclusions are not consistent: different reviews reach conclusions pointing in different directions on strontium-containing toothpaste [Fn47][Fn48], and a call for a standardised methodology has already been made within the domain [Fn53].
• Limits of design: the prevalence figures and risk factors cited in this article come mostly from cross-sectional studies [Fn18][Fn14]; they can show association only and cannot support a causal inference.
• This article contains no instruction on medication: the citation concerning drug prophylaxis merely presents the research conclusion that "this route is not supported by high-level evidence" [Fn83].

⚠ This section is a disclosure of medical risk and does not constitute advice on any individual treatment. The actual treatment and its results vary from person to person and have to 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.