So you're mad because you didn't pay your previous bill?
Yes I am a dentist. There are ways to prevent dental issues from occurring, however, some issues require intervention that should only be performed by a licensed professional. Here's an example... I rotate the tires on my truck to prevent uneven wear and extend their lifespan (prevention). If my tire gets a hole in it or the tread wears down I have to fix the hole or replace the tire (intervention).
Whenever my patients are sedated I'm not talking about them. My assistants and I are constantly having conversation. We talk about our families, weekend plan, and pretty much anything else that would be appropriate for someone else to overhear. He might be talking about you or maybe you are being a little paranoid.
If you don't feel comfortable there, I'd for sure suggest finding a place where you do. I'm very particular about my doctors and even the lady who cuts my hair. Find someone who you feel comfortable with, who listens to your concerns, who you trust and feel that they look out for your best interest.
We aren't all a bunch of greedy *******s.