changing orthodontist due to moving, I then realized that Dr. prince is quite over priced and please read your contract. My new orthodontist suggested a refinement of my invisalign's therefore a new set of Invisalign's were ordered and delivered free of charge to me. But under Dr Prince's contract, it indicated that any new or refined Invisalign's would be at our cost. also the price for a retainers charged by Dr. prince was exhorbent vs. the charge for retainers that my new orthodontist is charging. i feel the quality of expertise of my new orthodontist supersedes Dr. Prince