Dermal fillers are one of the most popular aesthetic treatments available today. As our faces age, we tend to lose volume in a very predictable way, and our faces begin to sag, creating deep furrows, tear troughs, marionette lines, and folds, and jowls start to form. Dermal fillers work to replace this volume that has been lost using a variety of natural molecules that are usually in a gel form that are injected under the skin. The most commonly used fillers at our London clinic are those made from a substance known as hyaluronic acid, which occurs naturally in the skin.