Children’s teeth grinding in sleep may be related to periodontal disease, calcium deficiency, intestinal parasitic infection and bad habits. 1. Periodontal disease: in the case of poor oral hygiene, teeth and gums are prone to lesions, which will be manifested in the clinical phenomenon of children grinding their teeth at night, and the more common diseases are dental caries and gingivitis. 2. Calcium deficiency: when the body lacks calcium, some children will also appear to grind their teeth. 3. Intestinal parasite infection: some children’s nocturnal teeth grinding phenomenon is related to intestinal parasite infection, the most common is roundworm. 4. Bad habits: some children also like to grind their teeth during the daytime, in which case, it will also increase the chance of grinding teeth at night. Children sleep grinding teeth, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.