There are many reasons for teeth grinding in the middle of the night, such as a tooth that has not been repaired for a long time, resulting in a habit of chewing food on the opposite side, and a bad bite can lead to teeth grinding at night. If the usual work pressure is very high, or people engaged in heavy physical labor at night is also prone to teeth grinding disorder. In addition, people who are engaged in delicate work such as clock repair are also prone to teeth grinding at night. If you eat too much at night before going to bed, you will also grind your teeth at night. In addition, teeth grinding in the middle of the night can not be ruled out in addition to genetic factors, more consideration for the following reasons: First, nervousness, emotional depression, it is recommended that do not give themselves too much pressure, communicate with others, transfer nervousness, or listen to some light music; Second, gastrointestinal disorders, it is recommended that the three meals should be even, do not eat and drink; Third, excessive fatigue, it is recommended that work and rest, pay attention to rest; Fourth, calcium, it is recommended to eat more food with high content of iron, or Eat more fruits and vegetables, etc.