The average degree of bruxism has little effect on the shape of the face, but severe bruxism can affect the shape of the face. In severe cases, bruxism can cause the chewing muscles to become enlarged, and it can also cause the lower jaw to move back and shorten the distance between the upper and lower jaws. The lower jaw is an important structure in the shape of the face, and the lower part of the face depends mainly on the shape of the lower jaw, so bruxism does have a certain effect on the shape of the face. Molar disorder is the involuntary contraction of the masticatory muscles under non-physiologic function, causing the upper and lower teeth to grind against each other. Not only does it have an effect on the shape of the face, but it can also lead to enamel being worn down and periodontal tissues being destroyed, affecting the normal shape and chewing function of the teeth. When a patient is diagnosed with bruxism, it is important to actively seek treatment.