Some children involuntarily clench their teeth after they fall asleep, which is known as “teeth grinding”. Teeth grinding can occur in phases, or it can occur every night, and the procedure varies. So what causes teeth grinding? First, indigestion: dinner eating too much or before going to bed, resulting in an overburdened digestive system, the gastrointestinal tract is still working after going to sleep, chewing muscles are also with the movement of teeth grinding. Second, rickets: some rickets and night grinding, accompanied by night terrors and night crying, sweating and irritability, etc., is due to the lack of calcium in the body. Mental factors: too much tension during the day or excessive excitement before going to sleep, resulting in the nervous system is still in a state of excitement after going to sleep, the jaw muscle group tension increases and causes teeth grinding. Fourth, intestinal parasites: part of the pediatric teeth grinding is caused by intestinal parasites. The most common are roundworms and pinworms, which parasitize the body and release toxins, causing a series of symptoms such as abdominal pain, shaw thinness, irritability, anal itching, and teeth grinding is also one of the symptoms V. Bite disorder. Occlusal disorder destroys the coordination of the masticatory organs, so the body to increase the teeth grinding to remove the occlusal disorder. There are many harmful effects of grinding teeth at night, mainly causing damage to chewing organs such as teeth, periodontal tissues, chewing muscles and jaw joints. The direct grinding of the upper and lower teeth can cause excessive wear and tear of the teeth, and it can also affect the quality of sleep. Parents can take their children to the stomatology department to check whether the teeth have occlusal disorders, if any, need to be adjusted, sleep in the supine position can reduce the mechanical pressure on the oral tissues, which can help to reduce the incidence of nocturnal teeth grinding. If there are intestinal parasites to take deworming drugs. If you have rickets, supplement calcium and vitamin D. Don’t let your child watch scary TV movies before bedtime, and don’t make him or her overly excited. Correct the bad habit of eating before going to bed. In addition, Chinese medicine believes that teeth grinding is mostly caused by “insect accumulation” and “stomach fire”, taking traditional Chinese medicine can also be effective.