1. dimple: In the traditional brewing process, the mixed grains are put into a jar, and then the middle is hollowed out, exposing the bottom of the jar, and piled up along the wall of the jar to form a pit called dimple. This should be the original intention of dimples. The facial features caused by muscle defects are similar to dimples, hence the name.

2. Pear vortex: refers to the dimple of Li Qian, a prostitute in the Song Dynasty. Later, it was generally called dimples on a woman's cheeks, a woman's smiling face, or a smile. Also known as "whirlpool". Second, the location is different.

1. dimples are located about 2~2.7 cm above the corners of the mouth. There are two kinds of dimples, round and linear. Generally, dimples are the most obvious when you laugh.

2. The pear pit is located at the lower side of the corner of the mouth, about 1 cm. Pear pits are smaller than dimples and are not obvious.

Dent formation

Dimples are formed by muscle activity under the skin. Most muscles of human body are firmly attached to bones through tendon fibers, such as pectoral muscles and lower limb muscles. The exception is the facial expression muscle, which is directly attached to the facial skin.

When the expression muscle contracts, it will affect the facial skin, so various wrinkles appear on the face, resulting in expressions of joy, anger, sadness and joy. The two dimples on the smiling face are formed by the relative influence of facial skin and facial expression muscles such as buccal muscle and smiling muscle.