Teeth grinding (bruxism) is the unconscious gnashing, grinding, or clenching of the teeth. It usually occurs during sleep. This process can grind away parts of the teeth, leaving flattened, worn-down biting edges; fractured enamel; and painful or loose teeth.

Although the exact cause of bruxism is not always known, it may be caused by:

• Emotional stress, fatigue, or sleep disorders.
• An abnormal bite or crooked or missing teeth.
• Alcohol or drug abuse.

Talk to your dentist if grinding is causing injury to your teeth. Your dentist will determine which treatment is right for you. A mouth guard may be recommended to help protect your teeth from further damage.