Face shape, that is, facial contour, is the most basic part of a person's appearance. The upper part of the face is an arc structure composed of maxilla, cheekbone, temporal bone, frontal bone and parietal bone, while the lower part of the face is determined by mandible. There are many factors that affect the beauty of the face, and the mandible plays a particularly important role in determining the basic structure of the face. For example, China beauty's ideal oval face is slightly round on the top and slightly sharp on the bottom, and the ratio of length to width is completely in line with Huang Jinlv.

After more than ten years of clinical practice in plastic surgery, Dean Huang Dayong found that the beauty of a person's appearance is mainly reflected in the lower part of the face, because there are two S-shaped curves from nose to lips and from lips to chin, which is the part that can best reflect the beauty of facial curves. The length of the face and the shape of the lower half depend on the shape and size of the chin. Therefore, the mandible is of special importance in appearance, and the mandibular angle constitutes the most basic line in facial contour.