Why do we grind our teeth?

Many causes: Someone may grind their teeth for a number of reasons. Often, the problem occurs because the muscles of the face and jaw are trying to get the teeth in a comfortable position. The muscles may be in spasm, you may have a tmj/tmd problem, stress, infection. Best to see a dentist asap. Often thew cause is difficult to determine, so may have to treat the symptoms with a mouthpiece.

Stress: Stress is usually the cause of tooth grinding or bruxism. Grinding may also be habitual or related to occlusion(the way your teeth come together).

Stress: In many cases, grinding of the teeth, or bruxism, is a manifestation of stress. This is often the case when it occurs as an unconscious habit during sleeping.