Should lip fillers only be injected by a board certified plastic surgeon?

You should start out with 1cc of juvederm filler or restylane filler and go from there. You do not want to overdo too much filler in the lips. It also depends on the look you are going for too. You can always add more filler to the lips if needed. Just remember if you are going to do your lips and you do not want to bruise you should not take any aspirins or anything that will thin the blood since brusing can occur. One syringe is typically $550

Keep in mind that you are asking someone to sculpt your face.  In addition, they really need to understand anatomy.  In my office, I do not use physician extenders in my office.  I personally do all the treatments.  These are very important services.  Don't you want the most experienced person doing your service?

Generally speaking, it is safe for a medical professional extender to inject under the supervision of a physician. With appropriate training and technique, lip injections can be safe. Good luck. Dr. Aldo