Smiling lips are in a natural expressionless state, and the corners of the mouth are slightly raised. But if you look closely, you will find that the corners of the mouth are not simply rising, but because the upper lip is M-shaped, the two sides are pressed down, and the lip bead is prominent, which makes the corners of the mouth rise.

Smiling lips are because the upper lip is M-shaped and the corners of the mouth are raised, not because the mouth really cracked a rising seam.

The characteristics of natural smiling lips are: lip bead and the corners of the mouth are in a line, and the corners of the mouth of the forcibly cut smiling lips are higher than those of lip bead, so it is easy to judge whether the smiling lips are natural or not.

From an aesthetic point of view, the mouth needs to meet these standards: the proportion of lips is appropriate, and the upper lip is one-third thinner than the lower lip. The mouth is the right size. Make a vertical line from the inside of the black eyes, which should be the size of a squab. The shape is radian, the upper lip is M-shaped, like a bird's wing, and the lower lip is a platform with smooth curve. In addition, beautiful lips should have obvious lip lines, lip bead is round and prominent, and deeper people are in the gutter. According to the width of the cleft, lips can also be divided into three types. Cherry has a small mouth with a narrow slit width of less than 35 mm, which is a beautiful mouth shape for women. The width of moderate oral fissure is between 36 and 50 mm, and most male and female oral fissures belong to this type; Wide mouth is often greater than 50 mm, commonly known as big mouth, which is not beautiful in appearance and sometimes needs plastic surgery. Too big lips can't bring beauty to people.