Benign hypertrophy of the mandibular angle of the chewing muscle is a common facial deformity in the Oriental population. The facial shape of this group is often “wind” or “use” shaped. The lower third of the face is significantly wider. In severe cases, the angle of the lower jaw protrudes backward and downward, and some have a short lower third of the face. The chewing muscle strips are visible or palpable when the patient bites. Most of the cases are bilateral, but a few are unilateral. Left-right asymmetry is also common in bilateral cases, while unilateral asymmetry is very pronounced. Most patients have no significant discomfort. A few patients have localized pain during mastication or have varying degrees of restricted opening. Differential diagnosis of masticatory hypertrophy: jaw protrusion malformation: double protrusion malformation, also known as double jaw protrusion, sharp (bird) mouth malformation manifested as open lips and teeth, unable to shut up naturally, upper and lower front teeth protrude, may have bony or non-bony protrusion, regardless of how the teeth protrude, jaw relationship is often still good. Due to the protrusion of the teeth, the function of the lip is weakened after a long time and it is impossible to close the mouth, the protruding teeth are exposed, but the lip red appears thicker and has an outward turn. First, boil a hot towel in the chewing muscle place for 5 minutes to let the muscle relax, with the index finger and the middle finger of the joint placed in the chewing muscle place forward circular massage, the face will feel sore, as long as you adhere to the effect will be.