If the size of the mouth does not match the size of the face, if it is too large, a small diamond-shaped tissue can be removed at the junction of the mucosa and skin at the corner of the mouth to reduce the mouth shape. It should be pointed out that before the above operation, there must be a correct diagnosis, that is, it is clear that the upper lip is too long, too thick and too large, and there is no arcuate curve, and the lower lip protrudes forward from the upper lip, which is not caused by hemangioma, lymphangioma, alveolar ridge deformity or mandibular protrusion; If you have these lesions, you can't use cosmetic surgery for your mouth and lips. Plastic surgery for excessive oral fissure: when the size of the mouth is not commensurate with the size of the face, a small diamond-shaped tissue is removed at the junction of the oral mucosa and the skin.