Clenching of teeth during sleep may be due to improper sleeping posture, poor bite relationship, etc., and should be promptly consulted to find out the cause of the disease. 1. Improper sleeping posture: improper sleeping posture may also trigger the symptoms of teeth clenching. Many people sleep habitually to one side of the head, which will trigger the masticatory muscles are not coordinated phenomenon, long-term pressure on the side of the masticatory muscles may occur abnormal contraction, thus appearing in the sleep clenching situation. 2. Poor bite relationship: overbite, temporomandibular joint disorders can lead to clenching or sleep clenching, teeth grinding habits. Over time, this will cause excessive wear and tear of the teeth, which needs to be treated by a doctor as soon as possible. However, other factors can not be ruled out, it is recommended to consult a doctor in time to clarify the cause of the disease, and then give targeted treatment.