shengjiaxin used long curve mandibular angle surgery, which is safe and effective. The shape of chin has distinct personality characteristics, men are resolute and women are handsome. Westerners attach great importance to the shape and size of chin in appearance aesthetics, but in China, the role of chin and its value in face aesthetics are often ignored. If the face is compared to a beautiful article, then the chin is like the wonderful finishing touch. The chin is symmetrical and beautiful, and the ending is good. Even if the facial features are flat, the smooth and balanced outline lines will give people a clear and pleasing feeling.