Teeth grinding is a part of the central nervous system brain fine run abnormal excitation leads to trigeminal nerve dysfunction, so that the trigeminal nerve innervated masticatory muscle occurs strong and continuous non-functional contraction, causing the teeth to chew movement and produce sound. There are three reasons for the occurrence of teeth grinding: 1, psychological factors Long-term mental tension, bad mood, psychological stress can occur when grinding teeth, is a common cause of grinding teeth. 2, dental and jaw factors teeth and jaw bone lesions can appear grinding teeth. 3, other factors Gastrointestinal disorders, parasitic diseases, calcium deficiency, blood pressure fluctuations, etc. can appear grinding teeth. Treatment: treat the cause of the disease psychological adjustment, pay attention to rest, reduce stress; active treatment of oral diseases; treatment of systemic diseases such as regulation of gastrointestinal function. Your teeth grinding is related to poor gastrointestinal, you should carry out treatment of gastrointestinal disease.