Smiling lips are a calm state where the corners of the mouth are also slightly elevated, manifesting a sense of smile, which is scientifically known as the corners of the mouth elevation. For some patients with drooping corners of the mouth, a mouth lift can be considered, as most of the drooping corners of the mouth are associated with loose and sagging skin and an overpowering descending corners of the mouth muscle. Traditional mouth lift surgery usually uses an external incision to remove the excess loose skin and disconnect the descending corners of the mouth to antagonize the force of the descending corners of the mouth and suspend the corners of the mouth upward to achieve the effect of a slight rise in the corners of the mouth. Currently, Botox injections are basically used to achieve the effect of lifting the corners of the mouth. In the case of thin lips, it is recommended to shape the lips by filling, which can be done with autologous tissue filler or hyaluronic acid injection. Autologous tissue fillers have limited results, and smiling lips will also be achieved through hyaluronic acid fillers, which require precise injections by the doctor. The degree of upturning of the corners of the mouth should be based on the slight upturning of the corners of the mouth when there is no expression, increasing affinity, and excessive pursuit of upturning will get the opposite effect.