Attention should be paid to the contour of the lip, the balance between the upper and lower lip. The upper lip should be three-quarters of the lower lip. The corners of the mouth, the fold angles of the lip edges, the distance between the lips and the nose, the slope, lines, and angles of the upper lip area, and the skin's condition around the lip should be considered as a whole in lip aesthetics.
In addition, the structure, color, alignment, symmetry of the teeth, the design of the gums, the smile, and the bite relationship between the lower and upper teeth directly affect the lip shape.
The lip is a tissue with dynamic aesthetics. Lips should be able to move, participate in mimics, be used comfortably during the speech, and be soft and flexible. If the lip made by paying attention to all these is compatible with the face, an aesthetic lip is formed.