While some people may have naturally thin lips, they can also be a sign of ageing, sun exposure or a result from smoking. As you get older the collagen in your lips breaks down and the muscles tire, leaving your lips looking and feeling thinner. This can also lead to wrinkles around the lips.

The procedure is usually done in an office and takes about 15 to 30 minutes. Before injecting, a healthcare provider will apply a topical anesthetic to numb the lips, and ice may be used before and after to help with swelling and bruising. Patients will see immediate results, but the final look won't be as pronounced until the swelling goes down, which can take about four weeks. The results typically last between 6 and 18 months. 

Lip fillers, a cosmetic treatment that can add volume and definition to lips, work by injecting a gel-like solution of hyaluronic acid (HA) just below the skin. HA is a sugar that occurs naturally in the body and is known for its ability to retain moisture, which helps maintain skin volume and hydration. When injected into the lips, the HA fillers immediately attract water, which adds volume and improves the overall health of the lips. Fillers can also stimulate collagen production.

The feeling of HA fillers in the lips is typically smooth and supple, and when administered correctly, should not be noticeable when the lips are at rest or in motion, such as when talking, smiling, or kissing.