Young skin is smooth and elastic because it contains a lot of hyaluronic acid. As we age, the amount of hyaluronic acid in the skin gradually diminishes. As a result, the skin becomes dryer, thinner and more wrinkled. We use fillers that are a long-lasting- but not permanent- synthetic form of hyaluronic acid. When fillers are injected under the surface of the skin, the gel mimics the naturally occurring substance by adding volume to the skin and smoothes out lines on the face.