Long-term teeth grinding is clinically known as teeth grinding, the onset of factors are more complex, may be oral problems, may be mental or neurological problems, may also be gastrointestinal problems, etc. It is recommended that patients go to the hospital for a clear examination to determine the cause of the disease and then take measures to improve accordingly. 1, oral problems: clinical believe that the misalignment of the bite relationship is an important factor leading to teeth grinding. Especially during the period of tooth replacement, it is easy to appear that the upper and lower teeth can not bite together normally, or the patient has temporomandibular joint disorder syndrome, the possibility of teeth grinding disorder will also be significantly higher than the general population; 2, mental problems: long-term mental tension, stress, overworked people, poor sleep quality, after sleeping part of the cerebral cortex is still in an excited state, will lead to the contraction of chewing muscles, the occurrence of long-term teeth grinding. In addition, if long-term in the mood of anger, anxiety, pessimism, there may also be long-term grinding of teeth; 3, neurological problems: the occurrence of teeth grinding disorder and the central nervous system information transmission of dopamine, norepinephrine abnormal changes, as seen in some psychomotor epilepsy patients, Parkinson’s patients, etc.; 4, gastrointestinal problems: for example, too much food before bed, food in the gastrointestinal indigestion, neural stimulation transmitted to the brain, so that the corresponding brain cells are excited, which leads to involuntary contraction of chewing muscles, manifested as long-term grinding of teeth. In addition, patients with intestinal parasitic infections are also prone to long-term teeth grinding during sleep. 5, nutritional deficiencies: If there is a picky, paranoid eating habits, especially do not love vegetables, resulting in calcium, phosphorus, magnesium and other trace elements and vitamin deficiencies, can cause involuntary contraction of facial chewing muscles at night, resulting in long-term grinding of teeth. In addition, vitamin D deficiency rickets, hyperthyroidism, etc., may also cause long-term grinding of teeth, it is recommended that patients visit the hospital for examination, and then the appropriate treatment.