Teeth grinding in bed at night may be caused by physiological factors such as excessive stress, but can also be seen in tooth defects, sleep disorders, parasitic infections and other factors. 1. Physiological factors: if the mental stress is too high, or when the emotional tension and anxiety before going to bed, the phenomenon of grinding teeth in bed may occur. 2. Dental defects: there are many causes, commonly caused by dental caries, trauma, cuneiform defects, etc., which can also lead to the phenomenon of teeth grinding during sleep. 3. Sleep disorders: endocrine disorders, metabolic abnormalities caused by sleep disorders, can appear in the night sleep phenomenon of teeth grinding. 4. Parasitic infections: If roundworm, whipworm, pinworm and other parasitic infections, the phenomenon of grinding teeth at night can occur. There are many causes of teeth grinding at night, if the symptoms have not been relieved, it is recommended to consult a doctor in time to avoid delaying the condition.