Some people have smile lines or dimples, while others don’t—and it often comes down to genetics, facial structure, and lifestyle. Smile lines, also called nasolabial folds, are creases that run from the nose to the mouth. They typically become deeper with age as skin loses elasticity. In contrast, dimples are caused by a variation in facial muscles and are often inherited. They appear when smiling and are generally seen as a natural and attractive feature.

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