Night grinding is one of the common diseases in dentistry, which affects the sleep and even the quality of life of the person grinding his teeth at night and his cohabitants. Active treatment measures should be taken for patients with severe nocturnal teeth grinding. The etiology of night grinding 1, dental factors Dental relationship incongruity is considered a major factor in teeth grinding, including malocclusion, missing teeth, tooth loss, unilateral chewing, etc., can cause occlusal disorders. In most children, due to an uncoordinated occlusal relationship, the early contact points result in the upper and lower jaw teeth not fitting well together, so the patient often develops a subconscious intention to bring most of the teeth into close contact. In the sleep this daytime idea will become chewing muscle spasm and contraction and cause night grinding. 2, psychological factors In recent years, experts believe that mental tension is one of the causes of night teeth grinding. Emotional tension, excessive fatigue, pressure on the mind or children playing 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 the contraction of the chewing muscle and the occurrence of teeth grinding. 3, systemic factors gastrointestinal dysfunction, endocrine imbalance, genetic factors, allergic disorders, etc. may cause night grinding teeth. Some scholars believe that when children accumulate food, indigestion, 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 career and family conflicts, 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.