Dermal fillers are products containing hyaluronic acid, which eliminate stubborn lines and indentations on the face. Hyaluronic acid is a natural substance in the skin whose stability weakens as we age resulting in lines that remain, regardless of facial expression. Dermal fillers, therefore, are used to replenish the amount of hyaluronic acid in the skin thereby adding volume and hydration to the face and resulting in the elimination of facial lines and a fuller youthful appearance.