Adults grind their teeth when they sleep at night. There are several common reasons in clinic: one is that genetic factors can cause night grinding. Another common reason is endocrine dysfunction or immune dysfunction, which can cause nocturnal bruxism. Another common reason is that mental and neurological factors can cause night bruxism, such as high mental tension, anxiety, depression, insomnia, high stress, etc. Irregular tooth arrangement and abnormal occlusion may also cause night bruxism, so it is necessary to go to the department of stomatology for orthodontic treatment. The cause of some night molars is not clear, so you can go to the department of stomatology to make molars to wear.