Cause

Teeth grinding is generally caused by psychological factors such as emotional stress or nervousness. Long term teeth grinding will damage the enamel and expose the dentine causing sensitive teeth.

Animation showing habitual grinding of teeth.
Treatment

To stop teeth grinding, the cause must be identified. If teeth grinding is severe, you should go to a dentist as soon as possible. The dentist will give appropriate treatment such as fabricating a "Mouth guard" to keep the teeth from further attrition.

Photograph of a set of lower teeth having exposed dentine due to habitual grinding of teeth. Photograph of a translucent mouth guard.
Prevention

To relieve teeth grinding, one should keep relaxed, and should have sufficient sleep and exercises to relieve stresses from daily life.