When comparing them to others in their field, I would say they are by far the worst I have ever seen. I will never return. I was in a lot of pain during my visit that I feel could have definitely been avoided if they had been more careful. I would never visit them again. I was very disappointed. It's been over 25 years since I visited her and I still am paying the price from all the damage she did. Do not let her anywhere near your mouth.