The causes of teeth grinding in children’s sleep may be heredity, mental tension, dental reasons, parasitic infection and so on. 1. Heredity: there is a certain relationship between teeth grinding and heredity, if the parents have the habit of teeth grinding, the child is also prone to teeth grinding. 2. Mental tension: If the usual stress is relatively large, often mental tension, will cause abnormal nerve function, can also cause teeth grinding. 3. Dental reasons: children grinding teeth is also related to dental reasons, the more common is the occlusal disorders, if for some reason there is a biting disharmony, the child will feel uncomfortable, so the symptoms of grinding teeth. In addition, if the child has periodontitis, it may also cause teeth grinding. 4. Parasite infection: children with intestinal parasites, will be in the intestinal secretion of toxins, these toxins stimulate the nerves to cause nerve excitation, so the teeth grinding. Long-term teeth grinding will cause serious wear and tear on the teeth, it is recommended for the cause of the symptomatic treatment, usually to regular work and rest, to develop good habits, pay attention to keep the oral cavity clean and hygienic.