Chop. Shop. I went in early 2008 for a routine checkup/cleaning. The dentist (who looked younger than me...I was 25 at the time) told me I had ELEVEN CAVITIES and they wanted to drill right then and there. I bailed, considering I had a clean bill of health six months earlier. Maybe if I hadn't brushed my teeth since then, it would be believable. Needless to say, I went to another dentist and, um, no cavities.
It's too bad they can afford all the billboards and commercials. That means there's a lot of overly trusting suckers out there that pay out the butt for totally needless and painful services.