As we age, we loose fat from under the skin (subcutaneous fat).  Because this layer is often thicker than the skin, loss of fat can change the contours of our face… ya know… the “older person’s gaunt look”.  Fillers are designed to replace the volume of fat that has been lost and bring back a fuller more youthful contour to your face. Filler are typically made from substances that naturally occur in our bodies so that our physiology doesn’t reject them.  They are simply injected under the skin into the subcutaneous area.  Take care however, the skill of the injector and their sense of aesthetic proportions of your face are key to a good outcome.