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2. Cheek Dimples Anatomy

The zygomaticus major is the muscle that determines whether or not a person has dimples. This muscle lifts the side of the mouth and allows people to smile. The presence of a double zygomaticus major is a possible cause for the existence of dimples. Other variations that cause dimples include shorter than average zygomaticus majors, in relation to other muscles in the face. In some people, dimples are the result of a bifid zygomaticus muscle. Bifid muscles possess a cleft or split into two parts.

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