There are many reasons for teeth grinding, including systemic diseases as well as dental diseases. Teeth grinding is sometimes manifested as a state of unconscious clenching of the teeth. The common cause of teeth grinding is excessive mental stress and emotional tension, which is not released during the day and is released at night in the form of night grinding. Teeth grinding may also be related to temporomandibular joint pathology, large open mouth movement or biting hard objects can also cause discomfort in the joint area, causing teeth grinding; temporomandibular arthritis can also be induced; it may also be due to uneven wear of teeth, the bite relationship is not normal so that the perioral muscles are in an abnormal state, leading to teeth grinding at night. Teeth grinding in children may be related to a preference for chewing on toys during the day, which can also manifest itself as teeth grinding at night. Sometimes eating too much for dinner increases the burden on the gastrointestinal tract, and while the digestive system is working, the chewing muscles contract involuntarily, causing teeth grinding. Or the symptoms of teeth grinding may occur due to muscle aches and pains and plant nerve disorders caused by vitamin D deficiency. Therefore, teeth grinding may be related to mental factors or abnormalities in tooth occlusion.