Dermal fillers are gel-like substances that are injected beneath the skin to help restore lost volume, smooth lines and soften creases, and achieve facial balancing. Commonly, filler is used to improve lines around the lips and mouth, restore volume to cheeks, contour chins, and help define jawlines. Fillers can also be used to plump up lips, round out booties, achieve more youthful looking hands, and much more.