Why do people have dimples?

Why can some people have dimples, but others? What makes those dimples?

The cheeks in the cheek are caused by a muscle in the cheek called the "zygomaticus major" muscle that is bisected. Before birth, this muscle can be divided into a muscle bundle at the upper corner of the mouth, and a muscle bundle at the lower corner of the mouth. This division creates a "hammock", and the skin there can be flexibly stretched between two muscles. When you smile, the muscles that work together and dimples become more prominent. Meanwhile, the split part has nothing to do with muscle.

According to McGill, the split chin is the result of not being used. The skin in the small hole is concave, forming a split chin. If you feel you have a tight chin, you can actually feel the chin opening, but don't worry, the chin is not harmful at all, and it can disappear in the next generation. So, your children can avoid choking their chin.