Teeth sensitive when brushing: pressure, bristles and the toothpaste that helps.

For sensitivity caused by gum recession, look for a toothpaste whose active has been tested against touch and not merely against cold, because a receded neck of dentine is what the toothbrush lands on. On the tactile probe that clinics use as their touch stimulus, a 2026 systematic review and network meta-analysis of 93 randomised trials put stannous fluoride furthest ahead of a benchmark fluoride paste at two weeks (a mean difference of 14.87 on the tactile threshold, moderate confidence), then arginine (9.78), then calcium sodium phosphosilicate (5.73), with potassium last at 4.55 and its interval crossing zero¹. S3 Sensitivity Science™ is built for this case, sensitivity where a receded gumline has left tubules open and the nerve over-reactive, with 5% potassium nitrate for the nerve and two hydroxyapatites for the surface and the tubule.

What was checked20 peer-reviewed studies, S3 consumer trial (ADSL, 2026), guidance from the NHS and the Oral Health Foundation

Which toothpaste helps sensitivity caused by gum recession?

One that does both of the jobs a receded tooth needs doing: narrowing the open dentine tubule and quietening the nerve behind it. The actives with pooled evidence against touch are stannous fluoride, arginine, calcium sodium phosphosilicate, hydroxyapatite and potassium, and their ordering changes with the stimulus you test. In the 2020 network meta-analysis of 125 randomised trials, the tactile ranking against a fluoride paste ran potassium plus stannous fluoride 3.05, potassium plus hydroxyapatite 2.47, calcium sodium phosphosilicate 2.14, stannous fluoride 2.02, strontium 1.43 and potassium on its own 1.23⁵.

The awkward part of the question is the words "caused by gum recession", because almost nobody has run that comparison. Searching PubMed on the tenth of September 2026 for gum recession together with dentine hypersensitivity and toothpaste, all three in the title or abstract, returns eighteen records in total; most are surveys, laser papers or reviews, and only a handful put a toothpaste in front of people recruited because their gums had gone back. The one paper in our library recruited that way is a fourteen-day non-randomised clinical trial of 40 young adults with gingival recession, in which a nano-hydroxyapatite paste plus a nano-hydroxyapatite suspension lowered air-blast sensitivity against brushing with no toothpaste at all, which is a comparison against nothing⁷.

Why does brushing hurt when eating does not?

Because the brush reaches the one part of the tooth that has no enamel on it. Brännström's 1966 review proposed that pain from exposed dentine comes from fluid moving in open tubules and stimulating the nerve endings in the pulp, the hydrodynamic theory the whole field still works from⁸. A bristle dragged across a bare root neck moves that fluid directly; a mouthful of food usually does not touch the gumline at all. The Oral Health Foundation lists brushing too hard or with a hard brush among the causes of sensitive teeth, alongside gums shrinking back, and names pain on brushing certain teeth as one of the things people notice⁹.

How much recession is normal is worth knowing before you blame yourself for yours. In a cross-sectional survey of 349 young UK adults, an observation and not a trial, every single participant had recession on at least one tooth and 42% had a site between four and eight millimetres deep; maximum recession rose with age, and correlated with sensitivity, with pocket depth, with bleeding and with erosive tooth wear². A larger European survey of 3,551 adults, another observation rather than a trial, financially supported by Haleon and with one author employed there, recorded recession of a millimetre or more in 87.9% of participants; a corrigendum to that paper exists and its content could not be read¹⁰.

The finding that matters most, though, is the one that cuts against the folklore: in that UK sample recession was universal, and most receded teeth were not sensitive². Recession is the doorway, not the pain. And a gum that is sore, swollen and bleeds when you brush is a different problem from a tooth that twinges — the NHS treats bleeding gums as the early sign of gum disease and asks you to have it looked at, rather than to buy a different toothpaste¹¹.

Did brushing cause the recession, or is that folklore?

The reviews are much more careful than the hygienist's telling-off. A 2005 narrative review of the whole question, whose funding is not stated, concluded that brushing with or without toothpaste appears to cause minimal wear to enamel in the absence of acids, that the evidence implicating brushing in gum recession is circumstantial, and that how these lesions begin is a matter of conjecture drawn largely from extrapolating laboratory work to the living mouth³. Its actual conclusion is a joint one: brushing, an acidic diet, tooth wear and sensitivity are probably linked, and dentine hypersensitivity is best understood as a tooth wear phenomenon.

That leaves the toothpaste standing on both sides of the argument. A 2013 review by the same group, also with no funding statement, argues that brushing with toothpaste removes the smear layer and so opens the tubules, that it adds to and may act synergistically with erosive loss from dietary acid, and that on those grounds toothbrushing with toothpaste belongs in the account of how this condition starts¹².

Force has been measured, and the result is not the one people expect. In a laboratory brushing machine, human enamel samples were brushed at 1.5, 2.5, 3.5 and 4.5 newtons; on sound enamel the four loads produced no significant differences between them, while on enamel that had spent 60 seconds in acid the load mattered clearly and the loss was fourfold higher than on the sound halves of the same samples⁴. Read that as mechanism rather than as a prescription. What it says is that pressure counts for most in the window after acid, which makes "wait an hour after fruit juice" and "brush gently" two halves of the same piece of advice; the acid half of the story has its own page on citrus, wine, fizzy drinks and the recovery window.

The other explanation people are offered for a notch at the gumline is abfraction, the idea that bending forces from the bite crack tooth substance away at the neck. It is a contested account, not an established one, and this page does not need to settle it: the practical advice — soft brush, no pressure, small circular movements, and a paste that occludes and calms — does not change either way.

Does an electric brush make it better or worse?

The randomised evidence says neither, gently. In a three-year randomised controlled trial in 90 adults who already had recession, with both arms using the same fluoride toothpaste, air-jet hypersensitivity fell significantly in the group using an oscillating-rotating powered brush and did not fall in the manual group, while tactile hypersensitivity did not change in either arm; two of the authors declare fees from a manufacturer of powered brushes, and all of them call the finding exploratory and say powered brushing should not yet be recommended on the strength of it¹⁴. In a twelve-month randomised controlled trial of 109 adults with pre-existing recession, recession did not get worse on either brush, and the powered heads showed far less bristle splaying after three months of use¹³.

The number people quote at each other comes from somewhere weaker. In the European survey of 3,551 adults, an observation and not a trial, financially supported by Haleon with one author employed there, people who used a powered brush had less dentine hypersensitivity than people who did not¹⁰. A cross-section cannot tell you whether the brush protected them or whether the sort of person who buys a powered brush also does other things differently. Take it as a reason not to worry about your powered brush, and not as a reason to buy one.

Are sensitivity toothpastes gentle?

Not automatically, and somebody has measured it. In a laboratory brushing model on 70 extracted human molars, six commercially sold desensitising toothpastes were brushed on dentine discs for a simulated six months; five of the six removed significantly more dentine than water, the greatest loss coming from a paste containing zinc carbonate with hydroxyapatite and the least from one containing pro-arginine with calcium carbonate, and the paper carries no funding statement⁶. Abrasivity is a property of the abrasive system, not of the word on the front of the box.

There is a standard laboratory scale for this, and comparisons of that kind are how products are placed on it. That laboratory comparison, whose funding is not stated, did not test S3, and S3 has never put a number on its own abrasivity, so this page cannot place S3 on that scale and nothing here should be read as calling it low-abrasion⁶. The sentence this page wanted to write about that has gone to the formulation team for substantiation instead of being printed here. This page also went looking for a published source giving the limit the international standard sets, and found none it was willing to cite, so no limit is quoted here either.

The complication in the middle of all this is that the brush changes the dentine surface by itself, and not in one direction. Human cervical dentine was worn on resin plates in the mouths of four subjects for eight weeks and brushed daily; in that in situ study the specimens brushed with a calcium hydrogen phosphate abrasive finished with most of their tubules open, and the specimens brushed with nothing on the brush finished with them plugged by an organic deposit carrying salivary minerals¹⁵. It is a surface observation from 1994 and not an instruction to abandon toothpaste, which would mean abandoning your fluoride with it. It is a reason to distrust any account of brushing that runs only one way.

Which ingredients have evidence against touch, and how long do they take?

Touch is where this literature is thinnest and strangest, and a page about brushing has to say so. The probe itself, and the other stimuli it is set beside, are described on the page about how desensitising toothpastes are tested. Start with the two pooled analyses. The 2026 network meta-analysis rated stannous fluoride 14.87 on the tactile threshold against a benchmark fluoride paste with moderate confidence, arginine 9.78 with low confidence, calcium sodium phosphosilicate 5.73 with low confidence, and potassium with or without fluoride 4.55 with an interval running from -2.54 to 11.64¹. The 2020 network meta-analysis ordered the same stimulus differently but put potassium alone bottom of the actives at 1.23, with the potassium-plus-hydroxyapatite node at 2.47 resting on two randomised trials and 140 patients⁵.

Hydroxyapatite carries the most direct touch evidence of the actives paired in a nerve-plus-mineral formula. Six four-week randomised trials pooled in a 2019 systematic review put nano-hydroxyapatite in front of its comparators when the stimulus was touch or an air blast, and level with them when it was cold¹⁶. One four-week double-blind randomised trial in 105 adults used a 15% paste and beat both a fluoride paste and a placebo on the tactile probe as well as on cold air¹⁷. Pairing the two mechanisms has been tested once in the UK: in an examiner-blind randomised controlled trial over fourteen days, a paste combining potassium nitrate with hydroxylapatite and aluminium lactate beat a potassium-nitrate-only control on every tooth-level measure, including the tactile probe, with relative risk reductions on the iced-water score of 55% immediately, 81% at seven days and 88.6% at fourteen¹⁸. The aluminium lactate is part of that formula, so the result belongs to the combination and not to hydroxyapatite alone.

Now the sentences that cost us something. A 24-week randomised controlled trial of 76 adults, funded by GSK Consumer Healthcare and first-authored by one of its employees, found small significant improvements in the cold-air score with a calcium sodium phosphosilicate paste and no significant change in the tactile threshold at all¹⁹. In a double-blind randomised trial of 120 adults funded by Procter & Gamble, whose own stannous fluoride paste was one of the arms, potassium nitrate did not beat the control on the tactile probe at day three and reached significance there only from week two onwards²⁰. And in a 2020 systematic review and meta-analysis of nine randomised trials in people whose sensitivity followed a deep periodontal cleaning, the desensitising agents beat the control on water and air stimuli while the control group did better on the mechanical stimulus, at very low certainty and with the authors declining to draw any conclusion²¹. That is the honest state of the touch evidence: real, small, inconsistent, and least convincing exactly where a toothbrush is concerned.

The table below reads by active, with the declared levels in S3 and the caveat that goes with them.

Where does S3 sit if brushing is what hurts?

A receded neck of dentine is the textbook case of both problems at once: hydroxyapatite narrows the open channel, potassium quietens the nerve, and neither ingredient does the other's job. That is the case S3 is designed for, which is why it carries an ingredient for each rather than one of them and a fluoride. It is meant as a complete daily toothpaste rather than a fortnight's course, SLS-free and used twice a day, which matters on a receded gumline because the mineral is laid down brush by brush on a surface that gets brushed twice a day whatever else changes.

Three things this page cannot claim, and each of them is worth saying out loud. The first is abrasivity: no measured figure is published for this paste, so nothing here ranks it against the tube in your bathroom. The second is the population: nobody has recruited people on gum recession and tested this combination in them, and the pooled estimate for potassium with hydroxyapatite rests on two randomised trials and 140 patients⁵. The third is the stimulus this whole page is about: on touch, potassium on its own comes last of the actives in that same analysis, which is exactly why a formula built for sensitivity pairs it with a mineral instead of selling it alone.

When is pain on brushing a dentist's question?

Once it stops behaving like sensitivity at all. A 2013 UK management review sorts these patients into three groups — gingival recession, tooth wear lesions, and periodontal disease or its treatment — and makes the point that no single strategy suits all of them, which is a polite way of saying that a toothpaste is the right answer for some of this and not for all of it²². Get it looked at if the pain is severe, if it arrives suddenly, if it outlasts a few weeks, or if it is one tooth rather than several; those are the Oral Health Foundation's thresholds, and behind them sit decay, a cracked tooth and infection⁹. A notch at the gumline deep enough to catch a fingernail is worth showing to a dentist too, who can fill it. If you have been on a sensitivity toothpaste for months and the twinge is getting louder, there is a whole page on what to rule out when a sensitivity toothpaste is not helping.

Gums are a separate question from teeth. If yours bleed when you brush, are swollen and sore, or are visibly shrinking, the NHS asks you to see a dentist rather than change toothpaste, and treatment there starts with cleaning and technique¹¹. Nor does gum that has gone back come back by itself: the Oral Health Foundation is explicit that the damage of periodontal disease can be controlled but cannot be reversed, and covering an exposed root is a surgical decision a dentist makes, not something a gentler technique achieves²³. Pain that throbs, lingers, wakes you or follows a knock is toothache rather than sensitivity, and the NHS treats it as its own thing²⁴.

Frequently asked questions

Is S3 gentle enough to brush a receded gumline with?

It is designed for twice-daily use as an ordinary toothpaste rather than a short course of treatment, and it is SLS-free. What this page will not do is turn that into an abrasivity claim: the desensitising pastes that have been measured in the laboratory span a wide range, that comparison carries no funding statement, and S3 was not among the pastes it tested⁶. What panellists reported is how the paste felt to them over two weeks, which is a different kind of statement from a measurement of dentine loss.

Should I use an electric toothbrush if my gums have receded?

The randomised evidence says a powered brush is safe in people who already have recession, and that recession did not progress on either kind of brush over twelve months¹³. A three-year randomised controlled trial found air-jet sensitivity improved with a powered brush and not with a manual one, but its authors, two of whom declare fees from a powered-brush manufacturer, call that exploratory and specifically ask that it not be turned into a recommendation¹⁴. If you like your manual brush, the useful change is technique and a fresh head every three months, not a new gadget.

Will my gums grow back if I brush more gently?

No. Gum that has receded does not return on its own; the Oral Health Foundation states plainly that the damage from periodontal disease can be controlled but not reversed, and root coverage, where it is appropriate, is a surgical procedure²³. Brushing more gently is still worth doing, because what it protects is what you still have.

How hard is too hard?

Nobody has published a figure in newtons for a person to aim at, and the laboratory work says pressure counts for most on a surface that acid has just softened rather than on a sound one⁴. The workable version is the one S3's formulation scientist gives and the Oral Health Foundation echoes: a soft brush, small circular movements, no pressure, and an hour between anything acidic and the brush⁹. If your brush head fans out well before three months, you are pressing too hard, and that is the cheapest feedback available.

Why does the same tooth hurt on the brush and not on ice cream?

Because the two stimuli reach the tubule differently, and the published outcomes for one active diverge depending on which stimulus was used. Potassium on its own sits last of the actives on touch in one network meta-analysis, while hydroxyapatite sits ahead of a benchmark fluoride paste on cold air with moderate confidence in another⁵¹. A tooth that answers the brush and ignores the cold is behaving normally for a bare root neck, and it is a reason to look at what the brush is doing rather than at what you are eating. The Journal's guide to how to stop sensitive teeth pain covers the routine side of that, and what are dentine tubules covers the anatomy.