Children grinding their teeth in their sleep may be caused by intestinal parasites, poor bite of upper and lower teeth, gastrointestinal disorders, etc. Parents are advised to give their children deworming treatment to protect the new permanent teeth and regulate the gastrointestinal function. 1. Intestinal parasites infection: small children sleep grinding teeth may be intestinal parasites, roundworms, can be deworming treatment, such as oral albendazole and other medications. 2. Upper and lower teeth bite is not good: small children sleep grinding teeth may be in the period of tooth replacement, upper and lower teeth bite is not good caused by the general after the tooth replacement period of sleep grinding symptoms can be slowly alleviated, such as worrying about grinding teeth on the new permanent teeth is not favorable, you can give the child to wear a jaw cushion to protect the new permanent teeth during sleep. 3. Gastrointestinal disorders: small children sleep grinding teeth may be related to gastrointestinal disorders, it is recommended that parents pay attention to the child’s diet, let the child eat light, easy to digest, nutritious food. If a child’s teeth grinding is serious, parents should take the child to a regular hospital, and follow the doctor’s instructions for medication.