No, applying dermal fillers does not make the skin sag. In fact, fillers are often used to add volume to areas of the face where there has been a loss of volume due to aging or weight loss, which can actually help to lift and rejuvenate the skin. Dermal fillers are injected beneath the skin to add volume and smooth out wrinkles and fine lines. The most commonly used fillers contain hyaluronic acid, a naturally occurring substance in the body that helps to hydrate and plump the skin. When administered correctly by a trained and experienced medical professional, fillers can provide a subtle and natural-looking result without causing sagging or other negative side effects. However, it is important to note that overuse or misuse of fillers can potentially lead to negative outcomes, including an overfilled or unnatural appearance, asymmetry, or infection. It is important to choose a reputable and qualified injector and to follow their instructions for post-treatment care.