Dimples are genetically inherited and are a dominant trait *. Dimples on each cheek are a relatively common occurrence for people with dimples. A rarer form is the single dimple, which occurs on one side of the face only. Dimples themselves are actually caused by having shorter muscles in certain areas of the face.
Dimples are considered attractive in some cultures. Babies commonly have dimples, but sometimes these disappear (or become less noticeable) as the muscles lengthen with age; consequently, dimples are often associated with youth.
It is possible to have one or both cheeks surgically modified to create a dimple. This can cost around $500 per cheek. *
The groove of the cleft chin is not just skin-deep, but also on the jawbone, as a groove in the vertical midline of symphysis menti and the soft tissue above it. It is probably the result of incomplete fusion between the left and right halves lower jaw during embryologic development *.