Shengjiaxin operation is a long arc operation of mandibular angle, which is safe and effective. Bone grinding of mandibular angle is a good method to effectively improve facial contour, which can help beauty lovers get rid of the trouble of big cheeks easily. The main reason for the large cheeks is that the mandibular angle of beauty lovers is too large, and the general weight loss method can not achieve the effect of improving the face shape. Only by using surgical means can the excessive mandibular angle of beauty lovers be effectively removed and the purpose of face-lifting can be achieved.