[everdimension]

While I mostly share the same opinion and tend to agree with your conclusion, strictly speaking your observations do not prove that the original doctors were wrong. One could argue that the "poorer" dentist offices are like that precisely because they are worse at treating patients and either aren't trained enough to notice the problematic signs or just care less because they have a lot of patients and aren't paid a lot.

I really wish these exams and observations were "provable" somehow and much more strict, and weren't a matter of collecting second, third and fourth opinions.