The so-called corner of the mouth lift surgery is to make the corners of the mouth lift slightly when the patient is calm and expressionless, showing a sense of smile, in order to increase the affinity. Usually, for some patients with drooping corners of the mouth, mouth lift surgery can be considered. Because most of the drooping corners of the mouth are related to the loose and sagging skin and the overpowering force of the descending corners of the mouth muscle, the corners of the mouth are usually lifted by an external incision method, which removes the excess loose skin and disconnects the descending corners of the mouth muscle to antagonize the force of the descending corners of the mouth, so as to suspend the corners of the mouth upward and achieve the effect of slightly lifted corners of the mouth. However, the corner of the mouth lifting surgery usually has certain risks, mainly including the following: 1, the formation of scars, or even hyperplasia, and relatively obvious, the need for injection, laser scar removal treatment, or even the need for another surgical repair. However, the vast majority of patients can achieve a degree of social distance observation is not too obvious, while the close distance can be seen; 2, the postoperative effect of the corner of the mouth up is not obvious, mostly due to improper postoperative care, lip action is too large, resulting in wire tautness and caused by the need for another surgical repair; 3, overkill, the corner of the mouth up surgery process, the corner of the mouth up too much and caused by unnatural shape, or the corner of the mouth area of the red lip is thick 4.Bilateral asymmetry, or facial nerve damage resulting in restricted corner of the mouth movement.