http://www.nytimes.com/2011/11/29/healt ... tists.html
Practicing medicine is not practicing science, so I can believe that there are some striking differences between the most up-to-date research and current medical practices, whether dental or otherwise. But fluoride cannot fill in enamel already lost, so.....there's that.
Those cavities aren't real. More likely, those are tooth lesions that go away after consistent* brushing and drinking with fluoride. Cavities destroy the lattice work that form the tooth. Lesions are just small soft spots that can get remineralized. If untreated, they become cavities that everyone usually thinks about. The dentist may not know it, but he's harming you with unnecessary treatment. The dentist thinks he is being proactive. That's how good people do the most evil, by trying to do good.
Hyperbolics aside, what does that tell you about medicine if it doesn't keep up with science? You wouldn't be ok with doctors using leeches on you, but you're ok with dentists drilling for the fun of it? It's very buyer beware out there because there's no accountability. Most dentistry is either paid for via opaque insurance or just accepted blindly. Putting a dentist's feet to the fire is nice, but the power differential makes it very difficult to challenge. I had a dentist charge me for some fancy mouth rinse,$65, and he refused to stop future rinses when I demanded it to cease. Then he criticized my info even though he didn't have any evidence either. I had another dentist call out a expensive intratooth cavity. If I didn't demand a second opinion, I'd be out more money, and part of two teeth. It mysteriously disappeared upon second examination by another dentist 3 months later. Even when prompted by me to look.
*Assumes a healthy adult eating a healthy diet, fluorided water, brushing with fluoride toothpaste, and no family history of cavities.