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. Symptoms and symptoms] 1, the patient has a typical grinding or clenching action during sleep, or subconsciously do these repeated actions when awake, accompanied by gagging sound; 2, serious grinding can make the joint surface, adjacent surface heavy wear; 3, serious grinding can lead to periodontal destruction, and make the teeth loose, displacement, gum atrophy, teeth “longer”, alveolar bone atrophy; 4, serious grinding can lead to periodontal destruction, and make the teeth loose, displacement, gum atrophy, teeth “longer”, alveolar bone atrophy. 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 spread to the head and neck, causing headaches and neck discomfort; 5, severe tooth wear, dentin allergy can occur. Diagnosis basis】 1. Patients have typical grinding or clenching movements during sleep. 2.Patients with persistent teeth grinding are seen with heavy wear on the symphyseal and adjacent surfaces. 3, there is periodontal, alveolar bone, gingival atrophy, tooth loosening, displacement and other changes. 4.Fatigue of chewing muscles and weakness of occlusion. 5, accompanied by symptoms of temporomandibular joint dysfunction. 6.Patients have head and neck pain symptoms after waking up. 7.Most often seen in children and adolescent male patients. Treatment principle】 1.Remove the causative factors, patients with tension should remove the psychological factors and local factors. 2.For severe and recalcitrant cases, a co-pad should be made. It is a removable device, hard and smooth, which can avoid interfering forces during lateral occlusion, thus protecting the tissues and muscles, and is checked regularly. 3.Treatment of various complications caused by excessive wear and tear.