What are the lines on your cheeks when you smile?

The lines on your cheeks when you smile are commonly referred to as "smile lines" or "nasolabial folds." These lines form due to the movement of facial muscles and the natural aging process, where skin loses elasticity and volume. They can vary in depth and prominence depending on genetics, skin type, and overall facial structure. While some people embrace these lines as a sign of happiness, others may seek cosmetic treatments to reduce their appearance.