If a sensitivity toothpaste helped at first and then stopped, the usual reason is that it only ever did half the job. Every mainstream formula either calms the nerve or seals the exposed dentine tubules, not both. Rule out a new problem with your dentist, then switch to a formula that does both, and give it two weeks.<\/p>
Around one in three UK adults lives with sensitive teeth, and three in four say the products they have tried do not give them effective relief. You have been using a sensitivity toothpaste for months, maybe years. It helped at first. Now a cold drink still makes you flinch, or the twinge has come back for no obvious reason.<\/p>
This guide explains why relief fades, what each active ingredient actually does, and what to look for when you switch.<\/p>
Yes, if the pain is new or has changed character. A toothpaste is a slow, cumulative product. Fluoride reduces decay over months of daily use, and hydroxyapatite fills micro lesions in the enamel over time. What neither does is settle a problem that arrived overnight, because sudden pain usually has a mechanical cause such as a cracked filling. Pain triggered by heat or by sweet foods is worth mentioning to your dentist too.<\/p>
The everyday sensitivity a toothpaste is built for is the slow building kind, most often caused by gum recession exposing the root surface, where thousands of tiny channels called dentine tubules run straight to the nerve. This is the hydrodynamic mechanism described by Splieth and Tachou (2013)<\/a>.<\/p> Because almost every sensitivity toothpaste on the UK market relies on a single active ingredient, and each active works in only one of two ways, while sensitivity has two halves.<\/p> Here is the part most people are never told. Sensodyne Repair and Protect uses Novamin, a calcium sodium phosphosilicate glass that activates on contact with water. To keep it stable in the tube, the paste has to be made without water, and potassium nitrate cannot go into a water free formula. So Repair and Protect can seal tubules, but it cannot calm the nerve. Other Sensodyne variants do the opposite: potassium nitrate alone calms the nerve but leaves the tubules open, so missing a few days brings the sensitivity back.<\/p> That is why \u201cmy Sensodyne stopped working\u201d is such a common complaint. It is usually not that the toothpaste changed. It is that it was only ever doing half the job.<\/p> Why is one active ingredient not enough?<\/h2>
Do hydroxyapatite toothpastes help with sensitivity?<\/h2>