With Voluma, I recommend that you choose a very experienced injector. It is new on the market, and, while it is made out of hyaluronic acid (like Restylane or Juvederm), the cross-linking makes it much more of a "solid" liquid. This may sound weird, but if you squirt Juvederm or Restylane onto a surface, they make a puddle. If you squirt Voluma, it looks like a Hershey's Kiss. Voluma is supposed to be very long lasting, and is meant to be placed deep (just above the bone) in the cheek area. It is a great filler, and when done correctly, looks amazing. Most doctors that inject a lot of Botox, also inject a lot of filler, but:Botox is not a filler. It is a protein that binds to the junction between the nerve and the muscle and causes the muscle to not respond to the nerve (so it decreases wrinkles because you can't contract the muscles in that area). Botox is always metabolized, and any unwanted outcome will go away. The major risks of Voluma being injected incorrectly (too superficially, too much in one location, no placed just above bone) would be the development of an unwanted lump or asymmetry. You can use hyaluronidase to dissolve the Voluma, but it still might leave unwanted asymmetry or lumpiness. Again, I would definitely recommend an experienced doctor.