Yeah, they all seem pretty much in agreement about fluoride good, sugar and acid bad. Opinions seem to vary on the specifics of brushing and flossing, and the relative merits of plastic vs amalgam fillings. Either way, they seem to put far too much weight on the effect of factors you can control (ie. food and teeth cleaning habits) and too little on the effects of luck, remembering to duck and choosing the right parents.
Obviously, you can't change your natural mouth chemistry, but it's all too easy for a dentist to assume that someone is a fizzy drink enthusiast in need of a patronising lecture, rather than having the misfortune to come from a family of people with bad teeth. (I say this as someone who lives on chocolate and orange juice, brushes once a day, and whose relatively minor tooth problems are mostly attributable to mechanical damage.)