Dermal fillers are used to restore volume in the face that has been lost due to the effects of aging and sometimes weight loss. As we age the skin becomes thinner, drier, and less elastic, collagen diminishes. The layer of fat between the skin and underlying structures is less. Bone resorption occurs, especially in menopausal and postmenopausal women, without the structural support of bone there are noticeable changes in the other layers of overlying skin and fat. Dermal fillers, mostly those made of hyaluronic acid, are used to restore volume and reinflate areas that are deficient.