Nocturnal teeth grinding is not the cause of joint disease, but one of its clinical manifestations. It is a reaction to try to save the joints by instinctively and spontaneously eliminating occlusal disturbances. However, contrary to expectations, the more you grind, the more disorganized the joints become. Therefore, many colleagues only see the second half of the relationship, mistakenly believe that the night grinding of teeth in the first, joint disease in the second. In fact, the teeth in the occlusal movement of the obstacle point, triggering the control of the joint movement of multiple groups of muscles subconsciously twitching, joints out of the appropriate position, and then spontaneous teeth filing, trying to eliminate these interference points, the formation of the phenomenon of night grinding teeth. In this way, it seems that it is the occlusal imbalance of the teeth that is the original sin as well.