When the girl smiles, two small dimples appear on her face, making her look even more charming and cute.

Dimples are formed by muscle activity beneath the skin. Most muscles in the human body are firmly attached to bones by tendon fibers, such as chest muscles and lower limb muscles. The exception is the expressive muscles of the face, which are directly attached to the facial skin. When the facial muscles contract, they affect the facial skin, causing various wrinkles to appear on the area, producing expressions of joy, anger, sadness, and joy, and can make various funny and interesting facial expressions. The appearance of two small dimples on a smiling face is caused by the relative influence of facial skin and facial expression muscles such as buccinator and smile muscles.

Not everyone will have dimples on their face when they smile. Whether you have dimples or not is related to the development of your facial muscles. People with less full smile muscles and less facial subcutaneous fat will generally not have dimples when they smile.