Dentin hypersensitivity is a painful manifestation resulting from a response of the openings of dentin tubules to oral environment. It is probably caused by movements of intratubular fluids, under the influence of different types of stimuli at the dentin surface. Hypersensitivity has been known for a long time and its treatment has always been difficult. Sometimes, by a kind of natural reaction to aggression, dentin is able to increase its degree of mineralisation but, most of the time, an active treatment has to be performed. Unfortunately the mechanism of dentinal pain is not well known and the symptoms of sensitivity are unspecific and subjective, so that the ideal compound for treatment does not exist. Many products have been tested, but the results are most of the time contradictory and the placebo effect is often very significant. In all cases the aim of the treatment remains the obliteration of dentin tubules, in order to obtain a decrease of dentin permeability.
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