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How about this: Do you know you have bad teeth? Who do you trust? I mean if it is has cavities or hurt then it is obvious. Sometime my dentist just schedule me for a crown because some of my teeth are spaced too far apart. Or claims that it has cavity, but it looks normal on the x-ray.
I have perfect teeth. I see a dentist and a dental hygienist 2 times a year, and I pay the dentist $$ to look at my perfect teeth after the friendly hygienist cleans them. Dentist really doesn't do sh*t here in this story.