One of the few times in managing hospital systems I was actually shocked at unethical behavior was when we took over management of a system that through accidents of history included a series of dentistry clinics. Dentists do not have any equivalent to a hippocratic oath, they have no professional obligation to be honest with their "patients". The overriding operational theme of the clinics was how to defraud "patients" with completely unecessary work to maximize profits and borderline defraud dental insurance. I understand that people have a dim view of ethics in american healthcare but this was what I would consider criminal behavior in a medical setting but as further experiences taught me, is the norm in american dentistry. Suffice it to say that we divested from the dentistry clinics asap.
Here is one swiss study showing that 30% of dentists committed fraud in the studed visits or were so incompetent that their behavior constituted fraud. I would guess that american dentistry is closer to 50%.
Have you had your wisdom teeth out? You are very likely to be the victim of dental fraud.