Hyaluronic filler substances are the safest, most natural way to add volume and rejuvenate the face. These products can be used to improve smile lines, lines around the mouth, marionette lines, as well as enhance the lips. A few simple injections can immediately improve unwanted facial creases. It also erases under eye circles or hollows, giving you a fresher more youthful appearance. This natural skin substance requires no allergy testing and can last from 4-12 months.