The abnormal action of involuntarily clenching or constantly grinding the teeth during the day or night when not eating is called teething disorder. First, the main complaint: patients with teeth grinding disorder to the hospital for treatment have three types of complaints: first, parents hear children grinding their teeth in their sleep at night and come to the hospital for treatment; second, patients are warned by fellow residents, automatically grinding their teeth after going to sleep, the sound is noisy, affecting others to sleep; third, people with craniomandibular disorders, go to the hospital for treatment and are asked by the doctor if they have a history of teeth grinding disorder. Therefore, teeth grinding disorder has not yet attracted attention, and the causes and mechanisms of its pathogenesis are generally unclear in clinical practice, and it has not yet been recognized as a disease that requires treatment. At the initial consultation of a patient with TMD, it is important to ask whether there is a history of teeth grinding disorder, because it is closely related to TMD, and both belong to a type of TMD craniomandibular system dysfunction. Second, the clinical examination: 1, the characteristics of dental abrasion teeth of patients with molar disease, the whole mouth are severely abraded, the front and back teeth are equally abraded, the incisive edge is sharp, the tip of the tooth has been worn flat, the buccal cusp slope of the upper teeth has become flat. The morphology of tooth wear, fully reflects the characteristics of the jaw movement of patients with molar disease: left and right amplitude, front and back movement amplitude is also larger, the teeth face the tooth surface empty grinding, the damage to the dental body is great, chewing in the upper and lower jaw teeth combined surface direct friction contact less, the degree of wear is low, only in the upper and lower teeth without food, empty grinding, teeth will leave serious signs of wear. 2.The patient with coincidental edentulism has heavy wear on the whole mouth, no overlap on the anterior teeth, sharp incisive edge, uneven, heavy wear on the lingual surface, shortened crown, and basically belongs to the pair of edentulism. Patients with edentulism are in contact with both anterior and posterior teeth due to severe wear, which is detrimental to TMJ, periodontal tissues, and masticatory muscles. 3, chewing muscle facial both sides of the middle of the buccal area hardening, chewing muscle high potential, strong contraction, some side more obvious. 4, TMJ Schuyler’s piece condylar anterior oblique plane and the corresponding part of the joint fossa is often an oblique plane, is formed by wear and tear. 5, the patient is more nervous upper and lower jaw teeth always clenched tightly, it is difficult to relax, rarely in the mandibular posture position. 6, maxillary facial EMG examination on both sides of the chewing muscle maximum tight bite potential is very high, can reach more than 2 times normal, both sides of the temporal muscle maximum tight bite point position is also very high. Third, treatment treatment: 1, the relief of teeth grinding —- bite plate application aims to mechanically block the upper and lower teeth contact and grinding movement, so as to treat teeth grinding, such as stability bite plate. 2, relief of chewing muscle spasm.