Tooth grinding at night may be the following reasons: 1, genetic factors, there are elders in the family have grinding teeth caused by genetic, such factors are not too ideal method to solve; 2, mental tension or life stress is also prone to grinding teeth; 3, grinding teeth at night may be gastrointestinal disorders or abdominal roundworm caused by blood or gastrointestinal function examination to find the cause, and then symptomatic treatment; 4, grinding teeth at night can be caused by neurological problems, such as cretinism or mental illness will also appear to grind teeth at night.