I replaced 6 front crowns. I loved the prototype however the permanent replacements were significanty different. At first he lied and told me that I would get used to them that they were the same. I explained how it was affecting my speech(lisp) and lips and he told me to go get silicone injections. I also experienced breakage of 3 lower teeth due to the undesirable change in relationship. I know he lied because I had saved my models and was able to measure the difference. He also used some tactics of abuse while I was in a very vulnerable situation.