1. Tooth decay near the gum line

2. Recession of the gums

As gums move away from a tooth due to conditions such as periodontal disease or toothbrush trauma,  the root surface becomes exposed.

3. Gum diseases

Inflamed and sore gum tissue may cause sensitivity due to the loss of supporting ligaments, which exposes the foot surface that leads directly to the nerve of the tooth.

4. Tooth grinding

This may cause sensitivity due to wear of enamel and subsequent exposure of  underlying dentin.

5. Cracked teeth

Broken teeth leads to creation of plaque and that causes tooth sensitivity