Lip filler, also known as lip augmentation or lip enhancement, refers to the use of dermal fillers to increase the volume, definition, and shape of the lips. Lip fillers are injectable gels made from various materials, with hyaluronic acid being the most commonly used. The procedure involves injecting the filler into the lips using a fine needle or cannula, targeting specific areas to achieve the desired outcome. Lip fillers can be used to add volume to thin lips, enhance lip symmetry, define the lip border, and smooth out fine lines around the mouth. Lip filler injections are typically performed in a medical office setting by a trained healthcare provider, such as a dermatologist or plastic surgeon. The procedure is relatively quick, and results are usually visible immediately, although there may be some initial swelling and bruising. The effects of lip filler treatment typically last anywhere from six months to a year or more, depending on the type of filler used and individual factors such as metabolism and lifestyle habits. Some people choose to undergo touch-up treatments to maintain their desired lip volume and shape over time.