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[Combatron]

Exposed root areas due to receding gums or periodontal disease.
Dentin exposure caused by vigorous brushing with a hard bristled toothbrush or incorrect way of brushing teeth.
Worn out enamel because of teeth grinding
Enamel erosion caused by chemical agents or acidic diet
Tooth decay, due to the lesions of the enamel surface
Teeth sensitivity can occur following routine dental procedures like teeth cleaning, root planing or tooth restoration. Teeth sensitivity problems caused by dental procedures are temporary, usually disappearing in 4 to 6 weeks.
Teeth whitening, as a result of high abrasivity or/and chemical action of the whitening products' active ingredients on the tooth tissues. Teeth sensitivity during bleaching process has become a very common problem due to the wide spread use of at home whitening products.

[tillup]

The reason we get sensitivity is because the outer layer of enamel which protects our teeth is no loger there. This can be either due to 1) a cavity which has gone through the enamel, exposing the second layer of your teeth (dentine) which is sensitive, or 2) your gum line has receded and the root is exposed, which is also sensitive.