Sensitive teeth are mainly caused by exposed dentine. If enamel of tooth crown, or gum and cementum on root surface has been worn or lost, then it will lose its protective function and the dentine will be exposed. The dentine has many fine dentinal tubules connecting to the pulp. When it is stimulated by eating or drinking hot, cold, sour, or sweet food and beverages, or when it is contacted by a toothbrush or dental floss, sharp pain will be felt.
Habitual grinding of teeth (bruxism).
Gum disease or aging leading to gum recession.
According to the oral condition, dentist may apply topical fluoride varnish or perform filling on the affected tooth surface.
The dentist may construct a “mouth guard” to prevent further wear off of teeth from habitual grinding.