Adult teeth grinding, also known as bruxism, is grinding teeth at night after sleep, the teeth unconsciously withstand greater occlusal forces, and the jaw does a certain regular movement, mostly in young people. The causes of teeth grinding are the following: 1, dental occlusion factors, occlusal relationship is considered to be the main factor of teeth grinding, including dental malformations, missing teeth, unilateral chewing, etc. 2, neurological factors, teeth grinding is a manifestation of sleep disorders, mostly occurs in the central nervous system information transmission medium dopamine abnormal changes. 3, psycho-psychological factors, mental tension, fatigue, excessive stress, psychological anxiety 4, physical factors, intestinal parasitic infections, gastrointestinal dysfunction, endocrine disorders, calcium deficiency, nutritional deficiencies, etc., are the causes of nocturnal teething disorder. 5, genetic factors, teething disorder is usually related to genetics.