The asymmetry between left and right face may be caused with malocclusion of teeth, functional hypertrophy of muscles, and overdevelopment of jaws, which can be corrected by correcting bad habits or orthodontics and orthopedics. 1. Correct bad habits. Left and right face asymmetry may be related to long-term partial side chewing, caused by one side of the muscle functional hypertrophy, generally by changing the chewing habits of bilateral chewing, asymmetry phenomenon can be reduced or disappeared. 2. Orthodontics. Left and right face asymmetry is also related to dental malocclusion, teeth are not aligned into a side of the anti-mandibular or lock jaw will cause face asymmetry. Through orthodontic treatment, the teeth will be aligned left and right symmetry to change the face shape. 3. Orthognathic. Face asymmetry may also be associated with underdevelopment or overdevelopment of the jaws. Orthodontic treatment is difficult to change the shape of the face needs to be corrected by orthognathic surgery. It is recommended to go to the hospital to confirm the cause of the asymmetry, and then correct the cause of the problem.