Children grinding their teeth at night may be caused by parasitic infection, dental and jaw factors, mental stress and other factors. 1. Parasitic infection: the presence of parasites in the child’s intestinal tract can produce viruses that stimulate the child’s nerves, making the nerves excited, pinworms in the crawl to the anus to stimulate the skin, thus causing the child to sleep grinding teeth. 2. Dental factors: missing teeth, unilateral chewing, malformation of the teeth and jaws can cause occlusal disorders, when the child enters a deep sleep will subconsciously carry out jaw movement, thus rubbing the teeth of the action, to achieve the balance of the occlusion, and thus appeared in the case of teeth grinding. 3. Mental stress: mental excitement, nervousness, anxiety or overwork during the day, study pressure, etc., can lead to some small children sleep at night grinding teeth. Usually there is no need for special treatment, adjusting the mind, relieve pressure after relief. Children grinding their teeth at night may also be related to other reasons, it is recommended to go to the hospital for timely examination, in order to clarify the cause of the disease, standardized treatment.