Baby sleep teeth grinding etiology is diverse, may be related to mental factors, dental occlusion factors, neurological factors, intestinal parasites and many other reasons. 1. Mental factors: before going to sleep, the baby’s spirit is too excited or just feed food, affecting the brain nerves, dominate the chewing muscles, resulting in teeth grinding performance. 2. Dental occlusion factors: baby occlusion disorder is a common cause of teeth grinding, when the baby’s teeth are poorly developed or milk teeth growth will appear teeth grinding phenomenon. 3. Neurological factors: when the baby’s central nervous system is dysfunctional, it leads to increased brain excitability and decreased sleep quality, resulting in teeth grinding. 4. Intestinal parasites: Most babies’ teeth grinding may be caused by intestinal parasites, and the most common parasites are roundworms. The most common parasites are roundworms, which live in the intestinal tract, stimulate the intestinal wall and stimulate the baby’s cerebral cortex through the nerves, resulting in teeth grinding. When the baby sleep teeth grinding phenomenon should be timely consultation, with the help of professional doctors, according to the cause of treatment, daily attention to the baby’s diet hygiene, while avoiding too excited before bedtime.