Sleeping involuntarily clenching the teeth is common in teeth grinding, teeth grinding complex causes, can be triggered by oral diseases or psychological and mental factors, neurological disorders. 1. Oral disease: when the oral teeth malocclusion or teeth missing for a long time, teeth excessive wear occlusal disorders and other oral diseases, may cause nocturnal teeth grinding. 2. Psychological factors: long-term mental tension and anxiety, depression, poor psychological state, work pressure and other psychological factors can also lead to the occurrence of nocturnal teeth grinding. 3. Neurological disorders: disorders of the central nervous system may also trigger muscle tension and cause nocturnal teeth grinding, such as epilepsy, Parkinson’s, schizophrenia and other diseases. Involuntary clenching of teeth during sleep can damage the periodontal tissues, and it is recommended to go to the hospital in time for treatment.