The common reasons for children to sleep grinding teeth before the mental excitement, lack of calcium, digestive tract parasites, sleep posture is not right or living habits. The baby’s teeth grinding caused by excessive mental excitement before bedtime is a relatively normal situation, generally the child is more excited to play during the day, after going to sleep at night, the cerebral cortex still belongs to the state of excitement, the baby through grinding teeth to vent this excitement. Daily baby’s lack of calcium absorption will cause the child’s body to show symptoms of calcium deficiency, calcium deficiency will cause the child’s face muscles to involuntarily contract at night, thus appearing teeth grinding symptoms. There are parasites in the child’s intestines, these parasites are frequently active at night, which will cause the baby to sleep restlessly and also stimulate intestinal peristalsis, causing the child to grind his teeth. The baby’s bad sleeping position or habits will increase the workload of the child’s gastrointestinal tract, causing the facial muscles to contract on their own, resulting in the phenomenon of teeth grinding. If children often grind their teeth, it is recommended that parents must pay attention to the child to the hospital in a timely manner, especially the examination of oral diseases, to see if the child has serious oral diseases, timely correction and treatment, so as not to affect the child’s tooth replacement.