Smile lines, also known as nasolabial folds, are the creases or lines that form around the mouth and extend from the sides of the nose to the corners of the mouth.

Smile lines, also known as nasolabial folds, are the creases or lines that form around the mouth and extend from the sides of the nose to the corners of the mouth. They are a natural part of facial expression and typically become more pronounced when a person smiles or laughs. However, over time, these lines can become more noticeable, even at rest, due to the ageing process and the loss of skin elasticity. As we age, the skin’s