From the front, buck teeth, wrong facial proportions; serious when not smiling; lumpy, especially when pursing the mouth; unattractive for photos; thick lower lip; uneven chin; big pancake face/U-shaped face; small chin/absent chin. From the side, the side like a fish; beak like angry; double chin; short neck; mouth to force to open and close. 1.Judgment of short chin Use the golden section method to divide the face into three parts, from the hairline to the eyebrows, eyebrows to the tip of the nose, the tip of the nose to the jaw, if the length from the tip of the nose to the jaw is short compared to the above two sections, then basically you can judge that the chin is short. 2, chin retraction The apex of the chin tip, the highest point of the upper lip and the foremost point of the jaw should be in the same straight line, according to this rule, you can determine whether the chin is short. That is, the straight line formed by the nose and mouth cannot intersect with the tip of the chin. The three points of the nose, chin, and lip are in a straight line, which is one of the criteria for a perfect side face (picture left). If they do not form a straight line, there are more or less problems. For example, the chin on the right is slightly receding, which can be corrected by adjusting the chin curvature.