Teeth grinding is caused by a disorder of the body’s dental anastomosis during sleep, which can affect the normal quality of sleep. The symptoms of teeth grinding may be caused by the body’s mental tension, gastrointestinal diseases, lack of trace elements in the body. 1, mental tension: if the body is frightened during the day, do some strenuous stimulating activities, or excessive mental tension, in the night sleep because the spirit can not get relaxed easily appear teeth grinding symptoms. 2, gastrointestinal diseases: in the daily diet do not pay attention to hygiene, easily lead to worms in the stomach, and worms will stimulate the nerves of the body, so that the nerve excitement, in the night sleep will appear grinding teeth phenomenon, it is recommended to take deworming medicine according to the doctor’s guidance in a timely manner. And if you eat too much food at night, can not get digested, accumulated in the intestines, aggravate the burden on the gastrointestinal tract, also easy to sleep with the symptoms of grinding teeth. 3, lack of vitamins or trace elements: in the daily diet if picky eating is easy to cause a lack of vitamins and trace elements in the body, will cause involuntary contraction of the facial chewing muscles, the symptoms of grinding teeth at night. Usually the organism grinds teeth at night due to the above-mentioned causes, and it is recommended to take a treatment plan according to its severity.