Dermal fillers are composed of hyaluronic acid, calcium hydroxylapatite, or other substances that add volume and fullness to the skin. As we age, the face naturally loses subcutaneous fat, which can result in sagging skin and a hollow appearance. Fillers help restore this lost volume by plumping up the skin, reducing wrinkles, and enhancing facial contours. They are commonly used to fill in nasolabial folds (smile lines), marionette lines, cheeks, lips, and under-eye hollows. Results are immediate, giving the face a refreshed and youthful look.