I went to Bruce Hanley for 2 cavities. He did such a poor job on both these - one of them he kept it so high that i was in pain for days due to a poor bite. I went back to him - it would have been a simple procedure to file it down but he insisted that was not needed. The second one, the filling came off and when I went again, it had become so sensitive - he did the root canal. My mistake that I didnt go to an endodontist. Anyway, that tooth developed sensitivity so on my 2nd visit, he literally knocked that off - causing jaw pain and then told me - "oh i seem to have missed one - this molar has 4 instead of 3 roots! "
I have found a better dentist - one who even adjusted my bite on the other tooth for free in 2 minutes (one which bruce hanley refused to fix).