Night grinding is one of the common diseases in dentistry, in addition to affecting the patient’s sleep and quality of life, it also has a greater impact on the patient’s dental occlusion, dental morphology and function, and its causes are as follows: 1. Dental occlusion factors Incongruent occlusion is considered to be a major factor in teeth grinding, including malocclusion, missing teeth, tooth loss, unilateral chewing, etc. During the period of tooth replacement, some children have early contact with their teeth due to uncoordinated occlusal relationship, resulting in the upper and lower jaw teeth do not fit well, so there is often a subconscious intention to make most of the teeth in close contact. This idea will trigger the contraction of chewing muscles during sleep and cause night grinding. The first hospital of Guangzhou Medical University stomatology Pan Guangshi 2, psychological factors epidemiological investigation that mental tension is one of the causes of night teeth grinding, emotional tension, excessive fatigue, pressure on the mind or children play too excited or overly nervous during the day, often cause the night can not sleep calmly, that is, after sleep, although most of the cerebral cortex in a state of inhibition, but there is still a part of the state of excitement, resulting in Chewing muscle contraction and tooth grinding. 3, systemic factors gastrointestinal dysfunction, endocrine imbalance, genetic factors, allergic disorders, etc. may cause night grinding teeth. When children accumulate food, poor digestion, so that the absorption of toxins secreted by bacteria in the gastrointestinal tract stimulate the cerebral cortex, so that its excitation or inhibition process is dysfunctional, resulting in night grinding. Intestinal parasitic infections are common in children, and the activities of parasites and the toxins and metabolites they secrete enter the body and stimulate the corresponding parts of the brain of the sleeping person, causing spasm or continuous contraction of the chewing muscles, which reflexively causes night grinding. Treatment of teeth grinding There is no specific treatment method that can completely stop the occurrence of teeth grinding. Clinical treatment of nocturnal teeth grinding is mainly aimed at reducing the damage caused by teeth grinding to the oral and maxillofacial system and alleviating the symptoms of muscles and joints. The treatment is based on the cause of the problem. Common treatment methods are the following: 1, adjust the mental state Appropriate arrangements and adjustment of the patient’s living habits, pay attention to the daytime do not play too excited or fatigue. Let them relax before going to bed, and do not watch stimulating television or movies. For adults should consciously look for a balance point, avoid overexertion, so that there is work and leisure, for some things that do not go well or stimulated, do not have to worry and overstressed; to rational treatment, the correct handling of the contradiction between career and family, reasonable arrangements for study, organized. Promote rest and relaxation before bed, do appropriate gymnastics, avoid excitatory food and smoking, improve the sleep environment, etc. is conducive to reducing the excitement of the brain. Mobilize the patient’s psychological role of self-control to reduce the occurrence of night grinding. 2.Adjusting the occlusal relationship of teeth and treating systemic diseases For patients with early contact, the teeth should be adjusted in stages to eliminate early contact. In order to protect the teeth and reduce wear, patients are often allowed to wear a single jaw full dental plate stabilization pad or a pressure-forming soft pad at bedtime. Although it has not been fully confirmed whether the pad can reduce the problem of night grinding, the effect of reducing tooth wear and maxillofacial pain is relatively clear. 3.Wake up stimulation during sleep This method uses biofeedback to make the patient be awakened by sound and other signals when night grinding occurs, thus temporarily stopping the grinding of teeth. Some people have performed temporary afferent electrical stimulation on the lips of patients when nocturnal teeth grinding occurs, and the results were effective in controlling teeth grinding. However, this method interferes with the sleep of the patient and the co-inhabitants, and the effect is not long-lasting.