Smile lines are the folds or wrinkles that run from the outer corners of the nose to the corners of the mouths. Deep nasolabial folds create shadows that can make the face appear prematurely aged and tired. Deep marionette lines running down from the corners of the mouth create shadows at the corners of the mouth that can make the face appear to convey sadness or negative emotions. The formation of smile lines is due to the natural processes of aging. Sagging and loss of cheek fats cause the appearance of smile lines or nasolabial folds as we get older. Luckily there is a solution! Smile line filler is injected into the nasolabial region to gently lift and soften the appearance of the lines or fold.