When toothpaste is not the answer: desensitising varnish, bonding and other dental treatments.

When a fair test of toothpaste has not worked, a dentist can paint a varnish or sealant onto the sensitive surface, bond a coating or a filling over a worn neck of a tooth, use a laser, or cover a root that the gum has left exposed. The painted-on and bonded options can act within days, sooner than any toothpaste in a review of 74 trials that grouped treatments by when they start to work¹, but most have been followed for months rather than years, and only treating the specific cause comes close to lasting. S3 Sensitivity Science™ is a daily toothpaste with 1450 ppm fluoride as sodium monofluorophosphate, and like any toothpaste its relief builds over weeks and is judged at two to four weeks; everything else on this page happens in the dental chair.

What was checked35 peer-reviewed studies, NHS and Oral Health Foundation pages, and product information as published by S3

When is toothpaste not the answer?

When a paste has had a fair run and not done enough, and when the pain was never a toothpaste's job in the first place.

A fair run means one paste, brushed morning and night, for long enough to judge. Desensitising toothpastes are measured over weeks: in the same review of 74 randomised trials, potassium nitrate reached a significant reduction only in the long-term group, not within a week or a month¹. A fortnight is too soon to give up, and the page on relief that builds over weeks explains the timetable. If a couple of months of daily brushing has not been enough, and especially if that is true of a second paste with a different active, the question has moved to the surgery. The four-week troubleshooting plan sets out how to reach that decision without drifting from tube to tube.

Some patterns were never a toothpaste's job. The Oral Health Foundation's reasons to book are short: pain that is severe, sensitivity still there after a few weeks, one tooth on its own, or pain that started suddenly, since any of those can mean decay, a crack, a gum problem or infection rather than exposed dentine⁵. A single sore tooth is its own subject, set out on the page about sensitivity toothpaste for one tooth. On the NHS's own advice, toothache lasting more than two days, or arriving with a swollen cheek or jaw, a high temperature or pain when you bite, needs a dentist rather than more waiting⁶. If the sensitivity arrived out of the blue, the Journal's piece on why teeth suddenly become sensitive goes through the usual reasons.

Once you are in the chair, the Oral Health Foundation names four things a dentist may do: put a desensitising treatment on the tooth, suggest a high-fluoride toothpaste, fill worn areas near the gumline, or deal with gum disease or whatever else lies behind the pain⁵. The examination that comes before any of them is described on the page on what a dentist checks for sensitive teeth. The rest of this page takes the treatments one at a time: what each has been shown to do, for how long, and how sure anybody can be.

There is no published timetable for moving from one rung to the next. An Italian expert panel built a decision tree that runs from ruling out other causes, to removing whatever is driving the sensitivity, to a toothpaste at home, and then to a treatment in the surgery with fluoride varnish tried first, and it found that the timing and the prognosis of these options had never been defined⁷.

What does the whole ladder look like?

Nine options, from a coating painted on in the surgery to an operation, set out with what the evidence actually measured. The column worth reading twice is the longest follow-up: it records how long anybody has watched, which is a different thing from how long a treatment lasts. Where a cell has a number, its source sits in the same row. The last row is the kind of product S3 is, with the price shown on its own site on the day this page was checked.

What can a dentist paint on, and how long does it last?

Several things, each with at least one placebo-controlled comparison in its favour, working for weeks to months, and the fading shows wherever anyone kept watching.

At the level of the reviews, the painted-on classes work and cannot be ranked. A 2013 network meta-analysis of 40 studies found that physical occlusion, chemical occlusion, laser and combined treatments each did better than placebo, that nerve desensitisation on its own did not reach significance, and that the active classes did not differ significantly from one another²⁸. A 2018 systematic review and meta-analysis of 25 randomised trials came out the other way on that one class: applied in the surgery, nerve desensitisation did differ from placebo, with P = 0.02, and so did chemical and physical occlusion²⁹. Two reviews give two answers to the same question, and this page does not pick between them.

Over six months or more the picture sharpens a little. A 2025 systematic review and meta-analysis that admitted only randomised trials followed for at least six months, 22 in all, put glutaraldehyde and low-level laser at the top for effect size and found that adhesive systems and calcium-phosphate agents did not reach statistical significance¹⁶.

The fluoride varnish, watched for six months

The most familiar option is a sodium fluoride varnish, and the trial that watched it longest also had a proper placebo. In a randomised controlled trial of 48 periodontal maintenance patients and 244 teeth, teeth were assigned to a low-level laser, a placebo laser that emitted nothing, a sodium fluoride varnish or a placebo varnish made of saline⁸. Both real treatments reduced pain straight away and kept their advantage over baseline and over the placebos for six months, while neither placebo changed significantly at any visit⁸. Inside the varnish group, though, pain scores rose significantly at three and six months compared with where they had been at one week and one month⁸. A varnish still ahead of placebo at six months and already climbing back is the honest shape of this rung.

A plain fluoride solution dabbed on fades faster. In a double-blind split-mouth randomised trial of 25 patients, a 2% sodium fluoride solution had cut sensitivity by around half at 15 days, and by three months its reduction was down to 22 to 24%, significant on the touch test alone¹⁴. In the same trial a glutaraldehyde-HEMA desensitiser went from a 92 to 93% reduction on touch and air at 15 days to about half that at three months¹⁴.

Not every varnish separates from placebo at all. In a double-blind placebo-controlled randomised trial of 121 participants, a calcium-phosphate-fluoride varnish did not differ from placebo at four weeks, while a glass-ionomer sealant reduced pain by 3.7 points on a ten-point scale against 2.3 points for the placebo¹⁰. The placebo group's own improvement in that trial is not small¹⁰, and it has a section of its own further down.

The newer coatings, watched for a year

Two small trials published in 2024 and 2026 reach twelve months¹⁷¹⁸. In a 2026 randomised trial of 34 participants, a resin varnish built on glass-ionomer filler kept pain on touch, air and cold significantly lower than a bioactive-glass air-polishing treatment for the whole year, and the air-polishing group, which had improved up to six months, relapsed significantly at the final visit¹⁸. In a blinded split-mouth randomised trial of 20 participants followed for 12 months, four single-visit protocols, among them a universal adhesive and a glass-based varnish, all left teeth less sensitive than at the start, and the adhesive and the varnish showed the greater effect at the end¹⁷. Neither trial had a placebo, so neither can say how much of that year belongs to the treatment.

The glutaraldehyde-HEMA desensitiser has the deepest record on this rung. It gave the largest relief throughout a six-month randomised trial of 50 adults that also used a water placebo¹². It was also among the treatments that acted within seven days in the systematic review of 74 trials¹. In a 2026 split-mouth randomised trial of 33 participants it was painted on after 3% potassium nitrate, and pain fell over 180 days whether or not an adhesive layer, or an adhesive and a flowable resin, went on top¹³. In a publicly funded 2026 randomised trial of 42 patients, four different in-surgery agents each produced a reduction that held over six months, beginning at 7 days for some and 15 days for others, with no untreated group to separate treatment from time⁹.

Hydroxyapatite applied in the surgery faded inside two months in a randomised trial of 45 patients, which is worth saying on a page published by a company whose toothpaste contains hydroxyapatite: it was ahead of water and of no treatment up to week four, and by week eight the groups no longer differed³⁰.

The placebo in the chair

Placebo responses in these trials are large, inconsistent and hard to predict, which is the best reason to ask whether a treatment has ever been tested against one. In a six-month randomised trial of 50 adults, water dabbed onto the sensitive teeth as a placebo reduced sensitivity significantly for the full six months, and by more than a commercial oxalate desensitiser¹². In a randomised crossover trial of 35 patients, water took 36% off air-blast pain at six months, against 55% for a calcium-phosphate paste³¹.

Elsewhere the placebo did nothing. The placebo laser and placebo varnish in the 244-tooth trial left pain where it was⁸, and placebo iontophoresis had gone from a reduction of up to 29% on the day to 0% at three months¹⁴. A network meta-analysis of 11 laser trials found a significant placebo effect straight after treatment²³. Nobody has pooled the size of the placebo response across in-office treatments: the search for such an estimate, run for this silo, returned one hundred and forty-one records without one.

Does bonding or a filling over the sensitive area work?

Probably, for a tooth with a worn or notched neck, but the large literature on those fillings was built to answer a different question, and the direct evidence is two small trials.

Fillings for worn necks of teeth, which dentists call non-carious cervical lesions, have been trialled for decades. What those trials count is whether the filling stays in, how its edges look, and whether the tooth is sensitive after the filling goes in. A 2020 systematic review and meta-analysis of 13 studies found glass-ionomer fillings were retained significantly better than composite resin, with the other clinical measures similar over 12 to 36 months, and pain that patients arrived with was not one of the things it pooled²¹. A 2017 systematic review and meta-analysis of 42 studies found that the bonding method made no difference to sensitivity after placement, or to how well the fillings stayed in, over follow-ups as long as four to five years²². Both are useful to a dentist choosing a material and nearly silent for a patient asking whether the pain will stop.

The two trials that did measure relief point the same way²⁰¹⁹. In a 12-month randomised clinical trial of 44 patients with sensitivity at the necks of their teeth, a glass-ionomer liner kept scores significantly lower than a resin desensitiser from the first visit to the last; some of those glass-ionomer edges overhung, which the authors warn can trap plaque, and some material wore away²⁰. And in a split-mouth randomised trial of 28 adults whose worn necks had not responded to desensitising agents, a composite filling on its own cut pain on a puff of air by 70.1% straight away and by 65.3% at 12 months, while teeth that had a diode laser first improved by about 78% at both points¹⁹. Every tooth in that trial was filled, so it cannot say what leaving the notch alone would have done, and 28 people is a narrow base¹⁹. Nothing else in the records read for this page puts a filling to the test on the reader this page is written for: someone for whom the painted-on options have already failed.

Bonding without a filling, an adhesive coat over the exposed dentine, has the thinnest long-run showing: adhesive systems did not reach significance at six months or more in the 2025 meta-analysis¹⁶. Layering an adhesive and a flowable resin over a glutaraldehyde-HEMA desensitiser also added nothing across 180 days in the 2026 split-mouth randomised trial¹³. On the NHS in England, fillings sit in Band 2¹¹.

Is laser treatment worth it?

It probably helps compared with nothing, it has not pulled clearly ahead of the painted-on agents, and the certainty behind its long-term result is very low.

The Cochrane review is the anchor. It pooled randomised trials that compared lasers with a placebo laser, a placebo agent or no treatment: 23 trials, 936 participants and 2,296 teeth³. On a puff of air, lasers may reduce pain in the short, medium and long term, where long term means more than two months; that long-term estimate, a mean difference of 2.60 points on a ten-point scale, rests on five studies and 564 teeth, and the review graded its certainty very low³. On touch, over the long term, the review found too little evidence to show a difference at all³. No trial in it measured quality of life, most reported no obvious adverse events, and the authors ask for studies of cost-effectiveness³.

Which laser does not seem to matter. A 2020 network meta-analysis of 11 randomised trials found four laser types all did better than controls straight after treatment and at one month, which that review calls the long term, with no significant difference among them and a significant placebo effect on the day²³.

Against the obvious alternatives, laser has not clearly pulled ahead. A 2021 meta-analysis of 13 studies setting Nd:YAG or diode lasers against topical desensitising agents found no significant difference in all but two of its comparisons, on low-quality evidence³². A 2025 systematic review and meta-analysis of lasers against topical agents found lasers ahead only in its long-term air-blast comparison, graded the evidence very low and concluded that it could not say which treatment is more effective³³. A 2022 systematic review of eight studies with at least six months of follow-up found a glutaraldehyde-HEMA desensitiser and laser equally effective, with low certainty and four of the eight studies at high risk of bias¹⁵. The 18-month trial of 32 patients that set two low-power laser doses, a high-power laser, the desensitiser and their combinations side by side found no differences between any of the nine arms, and had no untreated group².

Whether it is worth it for you comes down to a price that no source this page could cite prints. Laser treatment is not named on the NHS charges page for England¹¹, and the Cochrane authors' request for cost-effectiveness studies is still unanswered: the search on cost run for this silo returned fifty-six records and not one economic evaluation.

When does gum surgery come into it?

Only when the sensitive surface is a root the gum has pulled back from, and then it has the strongest numbers in this whole field.

Two systematic reviews agree. In a 2022 systematic review of 13 randomised trials, with 701 patients and 1,086 receding gum sites, surgical root coverage switched the sensitivity off in 70.8% of cases, and the fuller the coverage, the likelier that result⁴. The second review took in 19 trials and 486 patients, with follow-up reported from seven days to 30 months, and found the risk of sensitivity down by 67% without a stimulus and 53% with one²⁴. In a two-year randomised trial of 80 defects where a worn neck of a tooth sat above a receding gum, a partial filling combined with root coverage surgery reduced sensitivity significantly in every material group²⁵.

Both reviews set surgical methods against each other; neither holds a group that had a varnish, a paste or nothing, so how surgery stacks up against those options is unmeasured⁴²⁴. The operation is also for exposed roots, and a person whose sensitivity comes from worn enamel or open dentine elsewhere is not its patient. For the right tooth, this is the rung with the strongest result in the sensitivity literature, and no toothpaste, S3 included, has a result of that kind to put beside it. The gum side of the story, including what recession does and what can be protected, is on the page on gum recession and sensitivity.

Can any of these stop sensitivity permanently?

None has been shown to, because nobody has watched long enough, and the closest thing to lasting is treating the specific cause.

Put the follow-up evidence in one place. The longest trial of an in-office desensitising treatment found is 18 months, in 32 patients, with no untreated group². Placebo-controlled evidence for the painted-on treatments stops at six months⁸¹². A handful of trials reach a year, all of them small and none with a placebo^17201918. Across a 2026 systematic review of 31 randomised trials of newer treatments, most stopped at four to six weeks, a minority reached three or six months, and one resin-based trial reached a year³⁴. For surgery, the systematic review of 19 trials reports results out to 30 months²⁴.

The search behind that paragraph was run for this silo and run again for this page on the tenth of September 2026, and it returned one hundred and fifty-eight records both times. Among them, one trial ran to two years, and it combined a filling with gum surgery²⁵. The companion search for root canal treatment used against sensitivity returned one hundred and twenty-nine records and not a single trial or case series.

So the word in the heading is answered by the cause rather than the treatment. A root the gum has uncovered can be covered, with the strongest numbers on this page⁴. A notch worn into the neck of a tooth can be filled, on the strength of two small trials²⁰¹⁹. Open dentine with neither is managed, not finished: a coating when it flares, a toothpaste every day, and the habits that exposed it changed. Whether sensitivity eases with age on its own, and what daily care can realistically do over the years, is the subject of the page on managing tooth sensitivity long term.

Where does a daily toothpaste like S3 fit under a dental treatment?

Under it, not instead of it: the chair can act within days on the teeth that need it, and a daily paste is still in use at month three, which is when some of the painted-on rungs start to slip.

In the one six-month head-to-head comparison found, a daily toothpaste caught a varnish up. In a double-blind randomised trial of 51 patients over six months, with manufacturer-affiliated authors (two hold patents on bioactive glass, the basis of one of the pastes), both toothpastes gave more relief on the air test than a single sodium fluoride varnish from three months onwards²⁶. And in the one two-by-two trial found, combining a treatment with a paste did more than either: in a double-blind randomised trial of 80 teeth, a low-level laser plus an 8% strontium acetate toothpaste reduced sensitivity more than the laser or the toothpaste on its own at the seven-day assessment³⁵.

Practice already runs in that order. In a United States practice-based study of 1,862 patients seen by 171 dentists, a potassium nitrate toothpaste was the commonest recommendation, for 50% of patients alone or with something else, fluoride varnish came next at 28%, and a varnish with a potassium nitrate paste was the pairing recommended most often³⁶. The one UK look at what dentists use cuts the other way, and it is small, old, and an audit rather than a trial: in a 2008 audit of nine dentists in six Scottish general practices, with no placebo arm, the varnish and a dentine sealing resin produced significant reductions and the two arms that included a desensitising toothpaste did not³⁷. A UK guideline review for general dental practice concludes that no single desensitising agent is ideal, and that the dental team and the patient working together to change the habits behind the problem is essential³⁸.

Here is the part that costs this page something. In the review that grouped desensitising treatments by how soon they worked, only treatments applied in the chair made a significant difference within seven days, and no toothpaste did; S3 is a toothpaste, its relief builds over weeks, and nothing in its formula moves it onto the dentist's clock¹. S3 has not been tested against, or alongside, any dental treatment, so this page cannot tell you how it does after a varnish, a filling or a laser.

What it brings is the daily half. It carries 1450 ppm fluoride as sodium monofluorophosphate, full adult strength, and it pairs potassium nitrate, which works on the nerve, with hydroxyapatite, which works on open tubules, neither doing the other's job. How those two approaches differ, and what each cannot do, is set out on the page comparing tubule occlusion and nerve desensitisation, and how any sensitivity paste earns its claims is on the page on how desensitising toothpastes are tested. If your dentist recommends a high-fluoride toothpaste⁵, ask whether it replaces your everyday one, because S3's fluoride is the ordinary adult level and not that stronger kind.

What should you ask at the appointment, and what does it cost?

Ask what is causing it before asking what to put on it, and ask how long the chosen treatment has been followed, as well as whether it works.

On the NHS in England, the charges page read for this review sets Band 1 at £27.90, which it says can include "putting fluoride on the surface of your teeth", and Band 2 at £76.60, which may include fillings¹¹. Its list of urgent treatment, also at £27.90, includes "treatment of sensitive teeth which affects parts of the tooth called the cementum or dentine"¹¹. Laser treatment and bonded desensitisers are not named anywhere on that page, nor is gum surgery by that name, so this page does not guess which band they would fall into. The same page prints two sets of figures: its paragraph on scaling gives Band 1 as £27.40 and Band 2 as £75.30, below headings that say £27.90 and £76.60, so confirm the charge with the practice, which the NHS page says should tell you the cost before treatment starts¹¹. Private fees vary, and no source this page could cite publishes them. The page on free and low-cost NHS dental options covers who pays nothing and how to find an NHS dentist, and what a hygienist can do with varnish and cleaning is on the page on whether a hygienist can help.

Two things you will not find, whoever you ask. There is no UK clinical guideline on treating sensitive teeth: the searches for guidance from NICE, SDCEP, the British Society of Periodontology and the Faculty of General Dental Practice, run for this silo, returned one hundred and ninety-nine records and nothing from any of those bodies, SDCEP's own list of published guidance has no entry on it, and the patient section of the British Society of Periodontology's website, read for this review, does not mention sensitivity. And no study has asked whether any of these treatments is worth what it costs.

Frequently asked questions

Can I keep using S3 after a desensitising treatment at the dentist?

Yes, as your everyday toothpaste: S3 is made to be brushed with every day rather than used as a short course, which is exactly the role a daily paste has under an in-surgery treatment. After a varnish, a sealant or a filling, follow what your dental team tells you about brushing, eating and drinking; no source this page could cite gives a waiting time, so it does not offer one.

S3 itself has not been tested after any dental treatment. If your dentist recommends a high-fluoride toothpaste, ask whether it takes the place of your usual paste, since S3 carries the standard adult 1450 ppm.

How much does desensitising treatment cost on the NHS?

In England it depends on the band the dentist uses. The NHS charges page, read on the tenth of September 2026, lists "putting fluoride on the surface of your teeth" under Band 1 at £27.90 and fillings under Band 2 at £76.60, and its urgent treatment list at £27.90 includes treatment of sensitive teeth affecting the dentine or cementum¹¹. Laser and bonded desensitisers do not appear on it, and the same page prints £27.40 and £75.30 in its scaling paragraph, so ask the practice for the figure before you start¹¹.

Is a laser better than a varnish?

Not clearly, on the reviews available. Set against topical desensitising agents, lasers showed no significant difference in most comparisons of a 2021 meta-analysis³², and came out ahead only on long-term air blast, at very low certainty, in a 2025 one³³. Over six months or more, a systematic review found laser and a glutaraldehyde-HEMA desensitiser equally effective, at low certainty¹⁵. In a six-month randomised trial with placebo arms, both a low-level laser and a sodium fluoride varnish stayed ahead of placebo, with the varnish scores creeping up after the first month⁸.

Is root canal treatment ever used for sensitive teeth?

Not as a treatment anyone has studied for it. The search for root canal treatment, pulp treatment and last-resort care in dentine hypersensitivity, run for this silo and repeated for this page, turned up no trial, case series or guidance on using it for sensitivity. The NHS charges page describes root canal treatment as care "to treat an infection or inflammation in the centre of your tooth"¹¹. If pain is bad enough for it to come up, the better question is whether this is sensitivity at all, which is why severe pain and a single affected tooth are among the Oral Health Foundation's reasons to see a dentist⁵.

Will I still need a sensitivity toothpaste afterwards?

Probably, and nobody has tested stopping. The Oral Health Foundation says sensitive toothpastes have to be kept up to maintain their effect⁵. Some of the painted-on treatments in the trials above were already fading within a year⁸¹⁸, and in a six-month randomised trial with manufacturer-affiliated authors, daily toothpastes overtook a single varnish from three months²⁶. Neither of the surgical reviews reports what patients brushed with afterwards. The habits that exposed the dentine still matter too, and a UK guideline review calls changing them essential to treating the condition³⁸.