Oral surgery is currently only applicable to those who sag at a standstill. Regardless of the external cutting method and the internal cutting method, the main principle is to embed the suspension line and raise the corner of the mouth upward. The external cutting method needs to make an incision at the junction of the red and white lips at the upper and lower corners of the mouth. The appropriate amount of skin is removed above the corner of the mouth. It is mainly suitable for the sagging of the outer skin of the upper lip compared with the sagging factor. The effect of the incision method is more obvious, but the current observation is more obvious. A slight incision scar may be left at the corner of the mouth. The incision method makes an incision in the mucosal surface of the mouth at the mouth position, and the mouth angle does not leave any trace, but the lifting effect is relatively slight. 0.5cm Regardless of the internal or external cutting method, an outer incision of about 0.5 cm in length is required at the base of both sides of the nose, but the scar is usually not obvious after healing.