Most of the face with one side big and one side small is congenital developmental asymmetry, it may also be caused by bad habits such as sleeping on one side or chewing food with one side of the teeth in infancy, and serious asymmetry needs to be corrected by plastic surgery. If only the left and right side of the face muscles are not uniform resulting in face asymmetry, mostly for the partial use of one side of the teeth chewing or toddlers sleeping on one side for a long time and lead to the former through the correction of dental problems, correct the habit of chewing on one side of the teeth, or chewing muscles on the side of the injection injection of thinning the face can improve the symptoms of the latter due to the shape of the skull is already stereotypical, need to be corrected through plastic surgery. If the left and right sides of the face are not correctly aligned as a result of congenital development, then medical treatment is required to correct the shape of the face through plastic surgery such as bone grinding, bone amputation, or fat padding.