Two mechanisms, and why the difference matters to you
Calming the nerve. Potassium salts work at the far end of the system. They gradually reduce the excitability of the nerve endings inside the tooth, so the same stimulus produces a smaller signal. Nothing is sealed; the nerve simply becomes less reactive. This mechanism takes time — typically a couple of weeks of daily use before people notice much — and it fades again if you stop.
Plugging the channels. Stannous fluoride, arginine-based systems and calcium phosphate or hydroxyapatite compounds work at the near end. They deposit mineral inside the open ends of the dentine channels, so cold and sweetness no longer set the fluid inside them moving. Many people notice this type sooner, and it has the useful side effect of hardening the exposed surface.
Plenty of products combine both, which is a sensible approach and the reason you rarely have to choose in the abstract. What genuinely varies is the individual response: two people with the same complaint can get quite different results from the same tube, which is why the honest advice is to trial one properly rather than to hunt for a single correct product.
Reading a German toothpaste tube
Standing in a dm or Rossmann in front of four metres of shelf, in a language you may still be learning, is where most people give up and grab whatever says “sensitive”. Here is the vocabulary that actually decides it.
| What you see on the pack | What it means | Useful for sensitive teeth? |
|---|---|---|
| Für empfindliche Zähne / sensitiv | A marketing category, not a defined standard | Only tells you where to look — check the ingredients |
| Fluoridgehalt: 1450 ppm F | The fluoride concentration; the usual level in adult pastes in Germany | Yes, and it is the single most important number on the tube |
| Natriumfluorid, Aminfluorid, Natriummonofluorphosphat | Common fluoride compounds | All fine; the concentration matters more than the type |
| Zinnfluorid (stannous fluoride) | Fluoride plus a channel-plugging and anti-plaque effect | Yes — one of the more useful ingredients here |
| Kaliumnitrat / Kaliumchlorid | Potassium salts that calm the nerve response | Yes, with two to four weeks of patience |
| Arginin | Works with calcium to seal the channel openings | Yes |
| Hydroxylapatit | A mineral similar to the tooth’s own; deposits on the surface | Popular in Germany; helpful for many, evidence base younger than for fluoride |
| RDA / Abrasionswert | How abrasive the paste is | Lower is gentler; exposed tooth necks need a low value |
| Whitening / Weiß / Aktivkohle | Stain-removal pastes, usually more abrasive | Generally the wrong direction for sensitive teeth |
| Fluoridfrei / ohne Fluorid | No fluoride at all | Gives up the best-established protection you have |
| SLS / Natriumlaurylsulfat | The foaming agent | Neutral for sensitivity; some people with recurring mouth ulcers do better without it |
| Kinderzahnpasta / Junior | Lower fluoride content, matched to age | For children only, following the age recommendations |
One word of caution about “sensitiv” as a front-of-pack claim: it sometimes marks a paste designed for sensitive gums or a mild flavour rather than one containing an active ingredient for dentine sensitivity. Turn the tube over. Thirty seconds with the ingredients panel beats any amount of packaging design.
How you use it decides whether it works
This section matters more than the choice of product, and it is the part almost everyone gets wrong.
Twice a day, every day, without exception. Both mechanisms depend on accumulation. Using a sensitive toothpaste only when the tooth hurts is like taking half a course of anything: the effect never builds.
Rub it in at night. Once a day, put a pea-sized amount on a clean fingertip and massage it directly onto the sensitive tooth necks, then leave it. This puts far more active ingredient in contact with the right square centimetre than brushing ever does, and it stays there while you sleep.
Spit, do not rinse. Rinsing with water immediately after brushing washes the active ingredients straight down the sink. Spit out the excess foam and leave the rest. The same applies to mouthwash — if you use one, use it at a different time of day rather than as a chaser.
Soft brush, light hand. Hard bristles and heavy pressure wear the exposed necks further, which is what created the problem in a good number of cases. If your brush head splays outward within a few weeks, you are pressing far too hard. Electric brushes with a pressure sensor are helpful precisely because they interrupt this.
Not straight after something acidic. Enamel is temporarily softened after fruit, wine, cola or sparkling water, and brushing in that window scrubs away the softened layer. Rinse with water, wait around half an hour, then brush.
Stick with one paste for the whole trial. Switching every ten days means nothing ever has time to work, and you learn nothing from the experiment.
Give it four weeks — and judge it properly
Vague impressions produce vague conclusions. A simple structure gives you a real answer.
Note today, on a scale of nought to ten, the worst twinge you got this week and roughly how often it happened. Then use the paste as described above for four weeks, and rate it again once a week. Do not change anything else in the same period, or you will not know what helped.
Clear improvement means you have the right diagnosis and the right product. Keep going — most of these effects continue only as long as you keep using the paste, so this is not a course you finish.
Some improvement, but slow. Reasonable. Continue for another few weeks, and add a weekly fluoride gel if we have suggested one.
No change at all after four honest weeks. This is genuinely useful information rather than a failure. Straightforward exposed dentine usually responds to this treatment, so a complete non-response suggests the cause is something else: decay under a filling, a crack, an inflamed nerve, a leaking margin. That is the point to book an appointment instead of buying a fifth tube.
What a toothpaste cannot do
It is worth being blunt here, because the sensitive-toothpaste shelf implies more than the tubes can deliver.
A toothpaste will not fill a cavity, repair a cracked tooth, reseal a leaking filling margin, cure inflamed gums, stop you grinding at night, rebuild a worn notch at the gum line, or bring back gum that has receded. If your sensitivity comes from any of those, the tube can only ever take the edge off while the cause continues.
What deals with the causes is mostly undramatic: fluoride varnish applied in the practice for a concentrated dose exactly where it is needed; a small tooth-coloured filling to seal a worn or exposed neck, usually done in one appointment and often without anaesthetic; treatment of gum inflammation where the gums are the problem; a night guard (Knirscherschiene) for grinding; and a filling or crown where decay or a fracture is behind it — the everyday work described under Prophylaxis and professional cleaning – service page (EN). The fuller picture of what causes sensitivity in the first place: Sensitive teeth but no cavities: why healthy teeth can still hurt.
Whitening pastes, charcoal and fluoride-free options
Whitening pastes mostly work by removing surface stains, and many of them do that with higher abrasion. On a mouth with exposed tooth necks that is the wrong tool: you polish stains off the enamel while wearing away the far softer root surface underneath. They also do not change the natural shade of a tooth, which is a different matter entirely.
Charcoal pastes are popular and tend to be abrasive, and a good number contain no fluoride. If you like using one, treat it as an occasional extra rather than your daily paste, and keep a fluoride toothpaste as the everyday base.
Fluoride-free “natural” pastes are a personal choice, and there is no need to be dogmatic about it. But fluoride is the best-evidenced ingredient in the entire category, endorsed by German and international dental bodies alike, and giving it up means giving up your most reliable protection — particularly if you already have exposed root surfaces, which decay far more readily than enamel. If you prefer to avoid fluoride, say so at your appointment so we can plan the rest of your prevention around that decision rather than discovering it later.
What is normal — and when the tube is not the answer
Special situations
Children. Do not give a small child an adult sensitive toothpaste. Children’s pastes carry lower, age-adjusted fluoride levels, and German paediatric and dental associations publish clear age-based recommendations for how much paste and which concentration to use — we go through them with parents at the appointment rather than leaving it to the packaging.
Pregnancy. Ordinary fluoride and sensitive toothpastes are used as normal. What often changes during pregnancy is the gums, which inflame more readily, so bleeding gums are usually a reason for a cleaning appointment rather than a different tube.
After whitening. Sensitivity typically lasts one to three days. Starting a potassium-containing paste a week or two before treatment, and continuing afterwards, is a well-established way of reducing it: Sensitive teeth after whitening: how long the twinges last.
A dry mouth. Medication, mouth breathing and dehydration reduce saliva, and without saliva no paste performs as it should. Water, sugar-free gum after meals and a fluoride gel are worth combining here.
Receding gums. Where root surfaces are exposed, low abrasion becomes as important as the active ingredient, and fluoride matters doubly because root surfaces decay more easily than enamel.
Buying it in Germany. Drugstores such as dm and Rossmann carry essentially the same sensitive pastes as pharmacies, usually more cheaply, and a paste from an Apotheke is not automatically better. What pharmacies do stock are the higher-concentration fluoride gels used once a week, which are worth asking us about rather than choosing blind. If the shelf, the German ingredient names and the claims are simply too much, bring a photograph of what you are using to your appointment — we will tell you whether it is doing anything for you. You are welcome to have that conversation in English: English-Speaking Dentist in NRW.
Three to four weeks of twice-daily use is the fair test, and channel-plugging ingredients such as stannous fluoride often act somewhat sooner than potassium-based ones. Judge it at four weeks, not at four days — and use it consistently rather than only on bad days, because the effect builds up.
Not reliably. What decides the effect is the active ingredient, the fluoride content and the abrasiveness, all of which are printed on the tube regardless of price. Drugstore own-brands frequently contain the same actives as premium products.
It is usually the wrong choice. Whitening pastes tend to be more abrasive and are aimed at surface stains, while sensitive teeth need low abrasion and a sealing or nerve-calming ingredient. If you want both, alternate rather than replacing your sensitive paste — and have the sensitivity looked at first.
Hydroxyapatite pastes are widely available in Germany and many people report good results for sensitivity. For the prevention of decay, fluoride remains the ingredient with the strongest and longest-standing evidence behind it, which is why it stays the recommendation of German and international dental associations.
Two possibilities. Either the technique has slipped — rinsing after brushing is the usual culprit — or something has changed in the tooth. If a paste that worked for months stops working, or the character of the pain changes, that is worth examining rather than swapping products.
Toothpaste is not covered — it is an everyday purchase. The examination that finds the cause is ordinary dental care and is covered, as is treatment of the underlying problem: a filling, gum treatment, sealing an exposed neck. Preventive extras such as a professional cleaning are usually private, though a number of funds contribute towards them, so it is worth checking with yours.
The right toothpaste for sensitive teeth is a fluoride paste with a low abrasion value and either a potassium compound or a channel-plugging ingredient — used twice daily, rubbed into the sensitive spot at night, and not rinsed away afterwards. Give it four weeks and record what happens. If it helps, you have an inexpensive and effective way of managing the symptom. If it does nothing at all, that is not a reason to keep shopping; it is a reason to find out what is actually going on in that tooth.
Zahnarztpraxis Tsypin · Wuppertal. This article was medically reviewed and is provided for information; it does not replace an examination. Updated August 2026.
