Through surgery, incisions were made on both sides of the corners of the mouth, hanging wires were buried, and then the corners of the mouth were hung for about 3mm before stitching, so that the corners of the mouth were always in a natural upturned state. Injection of botulinum toxin inhibits nerve terminal conduction substances, thus blocking neuromuscular conduction and relaxing muscles. When the "contractile muscles" that control the corners of the mouth are relaxed, they naturally show an upward trend.
Surgery is divided into two ways: internal incision and external incision. Both need to bury the hanging thread, and then hang the corners of the mouth for about 3mm before sewing, so that the corners of the mouth are always in a state of natural upturning.
The external cutting method needs to make ">" at the red and white junction of the upper and lower lip corners. A-type incision is used to remove a proper amount of skin above the corners of the mouth, which is mainly suitable for drooping corners of the mouth outside the upper lip. Compared with internal incision, the effect is more obvious, but it will leave slight scar marks. The internal incision method is to make an incision on the mucosal surface of the corner of the mouth, and cut a small mouth on both sides to remove the redundant mucosa and submucosal tissue of the lip without leaving traces of the corner of the mouth, but the pulling effect is not as good as that of the external incision method. Injection method is to inhibit the conduction of nerve endings by injecting botulinum toxin, and then block neuromuscular conduction, thus achieving the purpose of relaxing muscles. When the "lower constrictor" controlling the corners of the mouth is relaxed, it naturally shows an upward trend.