Why are teeth so sensitive?

Tooth sensitivity?: Teeth have nerves to tell us when something is wrong. See a dentist for an exam and x-rays to determine the cause of your tooth sensitivity. Could be due to cavities, tooth erosions, gum recession, etc. Your dentist can tell you why and how to resolve this issue.

Teeth Sensitivity: Can be also due to bone loss exposing the root part of the tooth which is not covered by enamel.