Teeth grinding, also called bruxism, is often viewed as a harmless, though annoying, habit. Some people develop bruxism from an inability to deal with stress or anxiety.
However, teeth grinding can literally transform your bite relationship and worse, severely damage your teeth and jaws over long periods of time.
Teeth grinding can cause abrasion to the chewing surfaces of your teeth. This abnormal wear and tear will prematurely age and loosen your teeth, and open them to problems such as hypersensitivity (from the small cracks that form, exposing your dentin). Bruxism can also lead to chronic jaw and facial pain, as well as headaches.
Bruxism is somewhat treatable. A common therapy involves use of a special appliance worn while sleeping. Less intrusive, though just as effective methods could involve biofeedback, and behavior modification, such as tongue exercises and learning how to properly align your tongue, teeth and lips.