There may be various reasons for grinding teeth at night: 1, genetic factors, due to a history of hereditary disease in the family or a family history. 2, grinding teeth at night may be due to the patient’s intense activity during the day, mental tension, easy to produce the phenomenon of grinding teeth at night. 3, grinding teeth at night may be due to the presence of roundworms in the stomach, affecting the nerve disorder, easy to appear the phenomenon of grinding teeth at night. 4, grinding teeth at night may be due to vitamin The phenomenon of grinding teeth at night may also be due to occupational reasons, such as athletes or watchmakers, may appear the phenomenon of grinding teeth at night. Recent literature also shows that there may be temporomandibular joint disease cause occlusion misalignment, resulting in occlusal interference, prone to the phenomenon of grinding teeth at night.