Teeth grinding disorder is a habitual grinding of teeth during sleep or unconscious grinding habit when waking up called teeth grinding disorder. This disease is common in the clinic, and the treatment effect is not very obvious, and often brings mental burden to patients, and over time, can cause patients chewing weakness, temporomandibular joint fatigue. Severe nocturnal teeth grinding will also affect the rest of others, and even produce adverse consequences. 4, teeth grinding disease can lead to temporomandibular joint dysfunction over time. It can cause pain and fatigue in the jaws and chewing muscles, especially in the morning when the pain is obvious, and even spreads to the head and neck, causing headaches and neck discomfort; 5, severe tooth wear, dentin allergy can occur. Second, the diagnosis is based on 1, the patient has a typical grinding or clenching action during sleep; 2, the patient can be seen with persistent teeth grinding, with heavy wear on the sympathetic and adjacent surfaces; 3, there is periodontal, alveolar bone, gingival atrophy, tooth loosening, displacement and other changes; 4, chewing muscle fatigue, bite weakness; 5, accompanied by symptoms of temporomandibular joint dysfunction; 6, the patient wakes up, there are head and neck pain symptoms; 7, mostly seen in children, adolescent male Patients. Treatment principles 1. Remove the causative factors, and remove the psychological and local factors in patients with tension; 2. It is a removable device, hard and smooth, which can avoid interfering forces during lateral occlusion, thus protecting the tissues and muscles, and regular inspection; 3. Treat various complications caused by excessive wear. IV. Efficacy evaluation 1. Cure: (1) After treatment, no subjective symptoms and objective signs. (2) Restoration of occlusal force and disappearance of temporomandibular joint dysfunction symptoms. The pain in the head and neck disappears. 2. Improvement: (1) After treatment, subjective symptoms and objective signs are reduced. (2) The number of teeth grinding and the duration of episodes are reduced, and the occlusal force is enhanced. 3.Not healed: After treatment, the symptoms and signs did not improve.