What Air Polishing Can Actually Handle: The Line Is Drawn by One Phrase — "Extrinsic Stain"

What Air Polishing Can Actually Handle: The Line Is Drawn by One Phrase — "Extrinsic Stain"

Direct answer: Air polishing removes extrinsic stain and soft deposits that have attached to the tooth surface; it does not change the colour of the tooth itself — the review recommends low-abrasive powders (erythritol and glycine) for the removal of soft deposits and stains [F1]. In patients undergoing periodontal maintenance therapy, air polishing and conventional periodontal therapy presented identical clinical results, the difference lying in antimicrobial behaviour and patient-related outcomes [F3].

Geographic scope: This is general health education based on international literature. It does not cover any particular country's insurance scheme or regulations; for how care and fees are organised, follow the rules where you are. Every source cited in this card is international peer-reviewed literature; no national legislation or insurance-benefit rule is cited.

TL;DR — Air polishing is a cleaning instrument, not whitening

If you are considering air polishing, the first thing you should get clear about is this one sentence:

Air polishing deals with "the things that have attached themselves," not with the colour of the tooth itself.

Tea stains, coffee stains, tobacco tar, pigment deposits, plaque biofilm — these are collectively called extrinsic stain, foreign material that has accumulated on the tooth surface. Air polishing can remove them. A systematic review that included 42 laboratory studies described its use explicitly in the clinical implications section: low-abrasive air polishing powders, such as erythritol and glycine, are recommended for the removal of soft deposits and stains [F1].

Removal of soft deposits and stains. Remember that wording — it is exactly how air polishing is positioned in the literature.

So the goal of air polishing is to return your teeth to their original colour, not to make them whiter than they originally were. The gap between those two things is why so many people feel afterwards that "it wasn't what I imagined."

Three points worth stating up front:

• The type of powder determines the safety margin. The hard-tissue defects caused by sodium bicarbonate and calcium carbonate are significantly greater than those caused by glycine [F2]
• In terms of clinical outcomes in periodontal maintenance, air polishing and conventional instrumentation produce the same results; but in antimicrobial performance and patient experience, air polishing does better [F3]
• Comfort is air polishing's genuinely consistent advantage: when glycine or erythritol is used, discomfort is consistently equal to or lower than that of hand instruments and ultrasonic devices [F4]

Below, the boundaries are drawn one line at a time.

1. First, clear up a misunderstanding created by a Chinese name

In dentistry, the Chinese term 「噴砂」 in fact refers to two completely unrelated things at the same time. This is the easiest pit to fall into when you go looking things up.

The first is the air polishing used for cleaning teeth, which in English is air polishing (also called air-flow or air-abrasive). It uses a high-speed air stream to blow fine powder mixed with a water spray onto the tooth surface, washing deposits away. This is what this article is about — a cleaning instrument.

The second is the blasting used in materials processing, which in English is sandblasting. In a laboratory or a dental technician's workshop, alumina particles are used to roughen a material surface so that adhesive will bond to it. It appears in the pre-bonding treatment of zirconia crowns, in implant surface treatment, and in the preparatory steps for bonding orthodontic appliances.

These two things share the same Chinese word, but one cleans teeth inside your mouth and the other processes materials in a technician's workshop. If the content you found discusses shear bond strength, alumina particle size, or zirconia surface roughening — that is not the air polishing used for cleaning teeth, and it has nothing to do with what you need.

The way to tell them apart is simple: look at whether it is talking about "removing deposits from the tooth surface." If it is, that is air polishing for cleaning; if it is talking about "making materials bond more firmly," that is the other thing.

2. What air polishing can handle: extrinsic stain and soft deposits

Its scope of application in the literature

Back to that systematic review, the one that included 42 laboratory studies and assessed risk of bias with the RoBDEMAT tool. In its clinical recommendations it states that low-abrasive powders (erythritol and glycine) are recommended for the removal of soft deposits and stains, in order to preserve surface smoothness and marginal integrity [F1].

Broken down, air polishing has two kinds of target:

1. Soft deposits — plaque biofilm, soft debris and similar accumulations that have not yet calcified
2. Stains — surface discolouration caused by tea, coffee, red wine, tobacco and certain mouthrinses

What these two have in common is that both are "added on"; neither is the tooth structure itself. So once they are removed, what is revealed is what your teeth originally looked like.

"Extrinsic stain" is a real, measurable category

This is not marketing vocabulary. The dental literature has dedicated indices for measuring it.

A systematic review and meta-analysis of whitening toothpastes used extrinsic stain removal (ESR) as one of its primary outcomes, quantified with the Lobene stain index [F5]:

• 11 studies (n = 1962) assessed with the Lobene stain index gave a mean difference of −0.33 for stain area (95% CI −0.41 to −0.25; p = 0.00001) and −0.34 for stain intensity (95% CI −0.44 to −0.25; p = 0.00001) [F5]
• 6 studies (n = 2576) assessed with the modified Lobene index gave a mean difference of −0.42 for area (95% CI −0.58 to −0.25) and −0.30 for intensity (95% CI −0.39 to −0.21) [F5]
• 3 studies (n = 1322) assessed with shade guides gave a mean colour change of −1.80 (95% CI −2.33 to −1.26; p = 0.00001) [F5]

To be clear about this: what that review measured was whitening toothpastes, not air polishing. There is only one reason for citing it — to show that "extrinsic stain" is an independent, measurable clinical category with its own dedicated indices, and that the means of dealing with it (mechanical removal) and bleaching the tooth itself (peroxide acting on tooth structure) are two different pathways.

How to read this safely: the review recorded that whitening toothpastes were superior to regular toothpastes in removing extrinsic stain and in producing a whitening-like effect, but also produced more adverse effects — a risk ratio of 1.74 (95% CI 1.20 to 2.52; p = 0.003; 4 studies, n = 1322) [F5]. The same review also recorded that the quality of the evidence ranged from low to moderate, and called for larger, well-conducted independent studies [F5]. So what these numbers demonstrate is that "extrinsic stain can be improved by mechanical means" — not a promise about the effect of any product.

3. What air polishing cannot handle (this section matters more than the last one)

Since what air polishing deals with is "the things that have attached themselves," then anything that has not attached itself is beyond its reach.

It does not change the colour of the tooth itself

The following belong to intrinsic discolouration, where the discolouration occurs inside the structure of the tooth, not on the surface:

• Grey-black or blue-grey banded discolouration caused by tetracycline
• Dental fluorosis
• A single tooth darkening after pulp necrosis
• Yellowing of dentine with increasing age

Air polishing has no effect on these. It is not that the effect is poor; it is irrelevant in principle — what it removes is surface deposit, while the discolouration is inside the structure. This category calls for bleaching, or, when bleaching is still not enough, consideration of veneers, and that is an entirely different assessment process.

Its main target is not calcified calculus

The wording in the literature is "soft deposits and stains" [F1]. Calculus that has already calcified and hardened is not within that description.

This explains something that is commonly seen: in clinical practice most protocols pair air polishing with ultrasonics rather than having air polishing replace ultrasonics. A systematic review comparing air polishing with conventional periodontal treatment (hand instruments and/or ultrasonic debridement) included 14 randomised controlled trials out of 501 records, and recorded that the two produced the same results in clinical outcomes [F3] — "the same" means each has its own role, not that either one can be omitted.

It will not make your teeth whiter than they were

This is the point that most needs to be stated honestly. The ceiling of air polishing is the original colour of your teeth.

If after everything has been cleaned off you still feel it is not white enough, that means what you care about is not extrinsic stain but the shade of the tooth itself — and that calls for a different category of treatment, not "another round of polishing" or "a stronger powder."

4. The type of powder determines the safety margin

This is the most substantive and also the least mentioned variable in air polishing. Not all air polishing is the same.

A systematic review of the effects of air polishing devices on oral tissues searched MEDLINE, EMBASE and the Cochrane Library up to 18 November 2013, and included 17 studies out of 1266 abstracts [F2]:

• 13 reported the effects of air polishing on cementum and dentine. The hard-tissue changes (defect depth and volume) caused by sodium bicarbonate or calcium carbonate powders were significantly greater than those caused by glycine powder [F2]
• 4 assessed soft tissue. The potential of glycine powder air polishing to damage the gingiva was lower than that of sodium bicarbonate powder, and lower than that of curette instrumentation [F2]
• The review's conclusion: glycine powder air polishing can be applied safely to human root surfaces and gingiva [F2]

Another systematic review, this one on restorations, points in the same direction: air polishing — especially when sodium bicarbonate and calcium carbonate powders are used — increased surface roughness; while erythritol and glycine powders have the lowest abrasiveness [F1]. The same paper also recorded that both ultrasonic scaling and air polishing had a negative effect on the marginal quality of restorations [F1].

So the question worth asking is not "should I have air polishing" but "which powder will be used" — particularly when you have composite resin fillings, veneers or crowns in your mouth.

How to read this safely: the search for 25690301 closed in November 2013, so more recent evidence on erythritol powders falls outside that review's scope. And all 42 of the studies in 39908196 are laboratory studies, not clinical trials; the review itself records that the RoBDEMAT assessment showed the included studies to be deficient in randomisation, sample size reporting and blinding, and points out that methodological improvement and clinical research are needed before this can be applied to patient care [F1]. These are roughness changes measured in vitro, and they cannot be translated directly into "your filling will be blasted to ruin" — but they are enough to support the idea that "powder selection is a clinical decision that deserves discussion."

5. Does air polishing wear the teeth away? The honest answer

There is material loss, but it needs to be seen within a comparative context, and the numbers themselves contain a trap.

A systematic review published in 2026 analysed the effects of hand instruments, ultrasonic scalers and air polishing devices on dental hard tissue, focusing on material loss and surface roughness. The review searched MEDLINE, EMBASE and the Cochrane Library, included only studies using human cementum and dentine with at least six human tooth specimens, and excluded studies using powders other than glycine or erythritol, as well as studies of combined procedures [F6]:

• Hand curettes: loss of 0.86 to 20.60 μm per stroke (mean 6.0 μm) [F6]
• Ultrasonic scalers: 0.28 to 14.73 μm per stroke (mean 4.89 μm); 0.33 to 8.20 μm per second (mean 2.24 μm) [F6]
• Air polishing with low-abrasive powders: loss of 0.12 to 23.40 μm (mean 8.65 μm) [F6]
• The findings on surface roughness were inconsistent: in one study air polishing did not increase roughness, while other studies reported both increases and decreases in roughness [F6]

The review's overall conclusion is that calculated per second, material loss from air polishing devices is higher than from ultrasonic devices; calculated per stroke, loss from hand instruments is greater than from ultrasonic scalers [F6].

How to read this safely (please read this section to the end): the review itself states explicitly that, because of the heterogeneity among the included studies, comparing these results has its limitations [F6].

Where exactly do the limitations lie? Look at the units — the figures for hand instruments are "per stroke," ultrasonics has both "per stroke" and "per second," and the range for air polishing is not labelled with the same unit. "Per stroke" and "per second" are not the same scale, and ranking them directly produces a misleading conclusion. This is also why the review offered only a narrative description and did not perform a meta-analysis.

In addition, these are all in vitro studies, using extracted tooth specimens, with no saliva, no gingiva and no real operating time.

So the correct reading is this: all three types of instrument cause measurable material loss, and air polishing is not "completely non-abrasive"; but the existing data are not sufficient to support a one-sided conclusion that "air polishing damages teeth more" or that "air polishing damages teeth less." The point that can actually be acted on takes us back to Section 4 — the type of powder and the way it is used; that is the variable with a consistent direction of evidence.

6. Comfort and clinical outcomes: air polishing's genuinely consistent advantage

Patient experience

A systematic review on patient experience searched up to 18 November 2013 and included, out of 1266 abstracts, 9 studies that recorded pain and discomfort using visual analogue scales or patient interviews [F4]:

• The included studies used different powders, among them sodium bicarbonate, glycine and erythritol [F4]
• When glycine or erythritol powder was used, the discomfort reported in non-surgical periodontal therapy was consistently equal to or lower than that of root surface debridement with hand instruments and ultrasonic devices [F4]
• The review's conclusion: glycine powder air polishing appears to be associated with less discomfort in non-surgical periodontal therapy (both supragingival and subgingival) [F4]

Clinical and microbiological outcomes

A systematic review comparing air polishing with conventional periodontal treatment searched for randomised controlled trials published between January 1987 and March 2021, with two independent reviewers performing study selection, data extraction and bias assessment, and was registered with PROSPERO. The electronic search retrieved 501 records, of which 14 were included [F3]:

• Air polishing devices and conventional periodontal treatment produced the same results across the 14 studies [F3]
• Air polishing devices showed better antimicrobial performance, as well as better patient-related outcomes [F3]
• The review's conclusion: there is no difference between the two in clinical outcomes; but air polishing appears to bring improvement in antimicrobial outcomes, and for patients receiving supportive periodontal therapy it is a safer, faster and more comfortable option [F3]

How to read this safely: the review did not perform a meta-analysis because of the high heterogeneity between studies [F3]. This means the conclusions above are the product of narrative synthesis, with no pooled effect sizes or confidence intervals available for reference. Furthermore, the subjects of both of these reviews were patients receiving periodontal maintenance therapy, not the general population having a cleaning purely for the sake of appearance — extrapolating the conclusions to the latter warrants caution.

7. About cost

What this article cites is a database of dental papers, and it contains no fee data for Taiwan.

So the honest answer is: please ask the clinic directly about cost. Clinics differ in the type of powder used, in whether ultrasonic debridement is combined with it, in the number of sessions, and in whether a periodontal examination is included; those differences feed directly into the cost.

There is one thing worth asking about at the same time as the price: which powder is being used. On the evidence in Section 4, that question does more to determine the quality of the treatment you receive than the price figure does — particularly when you have veneers, crowns or composite resin fillings in your mouth.

Conclusion — Aim your expectations at what it can really do

What air polishing can do is clear: remove the extrinsic stain and soft deposits attached to the tooth surface, and let the teeth return to their original colour.

What it cannot do is equally clear: it does not change the shade of the tooth itself. Tetracycline discolouration, fluorosis, discolouration from pulp necrosis, yellowing of dentine with age — these discolourations are inside the structure, not on the surface, and air polishing cannot reach them.

If what troubles you is tea stains, coffee stains or tobacco tar, then air polishing is the right direction; and the thing worth asking one more question about is the type of powder — the most consistent variable in the existing evidence: glycine and erythritol have the lowest abrasiveness, and a lower potential to damage the gingiva [F2][F1].

If after a thorough cleaning you still feel it is not white enough, that does not mean air polishing has failed; it means what you care about is something else — and that calls for a fresh assessment of the cause of the discolouration, and a different pathway.

The most practical step: take the thing you actually care about to your dentist and discuss it — is it surface stain, or the colour of the tooth itself? Being clear about that matters more than which treatment you book. Take that question to your own dentist and book an examination, and work out together whether what you need is cleaning, bleaching, or no treatment at all.

Risk factors (what to know before treatment)

• The indication is also the limit: the literature positions low-abrasive powders for the removal of “soft” deposits and stains [F1]; calcified calculus, and intrinsic discolouration from tetracycline, fluorosis, pulp necrosis or ageing, all fall outside that description.
• The choice of powder is the safety margin: hard-tissue modifications (defect depth and volume) caused by sodium bicarbonate or calcium carbonate powders were significantly greater than those caused by glycine powder; for soft tissue, glycine powder air polishing showed less potential of harm to the gingiva than sodium bicarbonate powder or instrumentation with curettes [F2].
• Adverse effects on restorations do not come from air polishing alone: the review of laboratory studies records that air polishing increased surface roughness, especially with sodium bicarbonate and calcium carbonate powders, and that both ultrasonic scaling and air polishing negatively impacted marginal quality [F1]. If you have composite fillings, veneers or crowns, this is worth raising with your dentist before treatment.
• Material loss is real, but different units cannot be ranked: hand instruments 0.86 to 20.60 μm per stroke (mean 6.0 μm) and ultrasonic scalers 0.28 to 14.73 μm per stroke (mean 4.89 μm); air polishing with low-abrasive powders resulted in a loss of 0.12 to 23.40 μm (mean 8.65 μm), and the source does not label that range with the same unit of measurement [F6]. The review itself states that, because of the heterogeneity of the included studies, comparing the results has certain limitations [F6].
• Level of evidence and target population have to be read together: all 42 studies behind F1 are laboratory studies, and the RoBDEMAT assessments revealed shortcomings in randomization, sample size justification and blinding [F1]; F3 concerns patients undergoing periodontal maintenance therapy [F3], while the discomfort data in F4 come from non-surgical periodontal therapy [F4] — neither is a general population cleaning purely for appearance; F5 measured whitening dentifrices rather than air polishing, and its quality of evidence varied from low to moderate [F5].
• This card does not compile a list of contraindications: no separate literature search on contraindications was run for this card; whether air polishing is suitable, which powder to use, and whether ultrasonic debridement should be combined with it, has to be assessed by a dentist from your periodontal condition and the restorations in your mouth.

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.