Having sensitive teeth can mean anything from getting a mild twinge to having severe discomfort lasting for several hours. You are more likely to feel the sensitivity when drinking or eating something cold, from cold air catching your teeth, and sometimes with hot foods or drinks. Some people have sensitivity when they have sweet or acidic food and drinks.
Tooth is made up of an outer layer called enamel and an inner layer called dentine. The hard outer enamel protects the dentine which is softer and more sensitive to external stimuli such as hot and cold, and is more prone to wear.
The following dental issues can cause sensitive teeth: