There is William Kopp and his son in the dental office when I had work done. The elder gave me an extremely hurtful experience even though you may see in his office that he is a member of a certain organization and that he went to a tier 1 dental school so many years ago. The organization, I found out is really bogus. you can check this out for yourself. The pain injections did not help my anguish and when I asked him to stop what he was doing he said to his son in the room (maybe a DDS) that "it has to be done". I will never return. his hand is very heavy and large. I think that he should retire.