Filling materials used to correct wrinkled and depressed appearance of the face are applied by injection under the skin folds with wrinkles. Currently, hyaluronic acid-based filling materials are most commonly used for this purpose. Hyaluronic acid is one of the essential components of the skin and, when injected under the wrinkles, it corrects the throughing by absorbing the water and thereby swelling. Filling materials containing hyaluronic acid are not only used to prevent wrinkles but also to make the depression of malar process explicit, to enhance the lip and to make the lip contours more distinctive. Fat obtained from your body may be used as filling material as well.