First, intestinal parasites, roundworms in the stomach. Roundworms parasitize the child’s small intestine and not only plunder nutrients, but also irritate the intestinal wall, secrete toxins and cause indigestion. The frequent vague pains in the child’s stomach can cause insomnia, irritability and grinding of teeth at night. In addition, pinworms can also cause teeth grinding. Pinworms are normally parasitic in the human colon, and after the child goes to sleep, the pinworms will quietly crawl to the anal opening to lay eggs, causing anal itching, making the child sleep restlessly and grinding teeth. Response strategy: Deworm your child. Develop good hygiene habits at regular times. Second, over-eaten dinner. Over-eating dinner, or extra meals before bedtime, not only affects nutrient absorption, but also increases the burden on the gastrointestinal tract. Because when you go to sleep, the gastrointestinal tract is still accumulating a lot of undigested food, the entire digestive system will have to “overtime”, continuous work, even the chewing muscles are mobilized, involuntary contraction, causing teeth grinding. Coping strategies: do not let the child eat too much before bedtime, after eating a little stay for a while and then let the child go to bed. Third, lack of vitamin D. Children suffering from rickets, due to disorders of calcium and phosphorus metabolism in the body, will cause bone decalcification, muscle pain and plant nerve disorders, often appear sweating, night terrors, restlessness and night grinding teeth. Coping strategy: under the guidance of the doctor to the child to supplement vitamin D, calcium tablets, usually more sunshine, night grinding situation will gradually reduce. Fourth, mental factors. A few children usually do not grind their teeth, but if they listen to a heart-stopping story before going to bed, or just after watching scary, tense television or cartoons, due to overexcitement of the nervous system, there will also be nocturnal teeth grinding. Another reason is stress, such as not adapting to kindergarten life, fearing a certain child in the class, arguing with parents or family members, etc., can make the child’s mind tense and lead to grinding teeth at night. In addition, some overly active children can also occur to grind their teeth at night. Coping strategies: Don’t let your child watch TV that is too stimulating before bedtime. Often communicate with the teacher and the child, if the child has a knot, help him solve it in time to relieve his psychological pressure. V. Misalignment of teeth. Excessive force of chewing muscles or long-term chewing with one side of the teeth, as well as the poor relationship between the teeth bite, the occurrence of temporomandibular joint dysfunction, can also cause teeth grinding at night. Moreover, children whose teeth are not aligned, the position of his chewing muscles is often abnormal, and when they sleep at night, the chewing muscles will often contract unconsciously, causing teeth grinding. Coping strategy: take your child to the dentist regularly, and do orthodontics and treatment according to the doctor’s recommendations. Sixth, poor sleep position. If the child sleeps with his head often to one side, it will cause the chewing muscles to be uncoordinated, so that the side of the chewing muscles under pressure will contract abnormally, and thus teeth grinding will occur. Children sleep with their heads covered at night, due to the excessive accumulation of carbon dioxide and insufficient oxygen supply, will also cause teeth grinding. Coping strategies: If you find your child sleeping in a bad position, help him to adjust it in time. Usually do not let your child develop the habit of sleeping with his head covered.