The use of a hyaluronic acid (HA) gel to plump or lift an area.  Most commonly used in cheeks, lips, tear troughs, temples, chin, jaw and nasolabial folds.   HA is a natural substance already found in the body and by re-injecting this into the desired area you will see  lifting and plumping of the tissue.  Longevity depends on area and person. For instance, a cheek filler lasts much longer as it's a thicker molecule placed deep to lift, whereas lips need a softer product to get natural results and therefore a smaller molecule gel is used but doesn't last as long.