Smile lines, or nasolabial folds, run from the side of the nose to the corner of the mouth. Smile lines that extend from the corner of the mouth toward the chin are called marionette lines. Both nasolabial folds and marionette lines are the result of the loss of facial volume and skin elasticity as we age. These smile lines can make you look older, tired or unhappy even when you feel young and vibrant.
Causes of Smile Lines
The cause of smile lines is the loss of facial tissue volume through the natural aging process, loss of collagen and elastin in the skin, sun damage and repetitive muscle motion, which all contribute to nasolabial folds and marionette lines..