I do agree that some US dentists are perhaps more profit driven, but I would prefer that and have the lovely white teeth that most American's seem to have than the reputation us Brits have (due in large part, to this very kind of attitude of British dentists) of having poor teeth.
I have needed root canal treatment this year, I attended the dentist every time I was asked to ( say, once every 4/5 mths over the last 2 yrs with the dentist telling me he would save the tooth) but the pain was just so bad, I opted to remove the tooth.
He now tells me that he will refuse to treat my sudden "bone loss" unless I give up smoking ( I am trying, believe me!) but he has not said anything about this in the last 2 years and yet suddenly it has got so bad he now feels he has the right to say he will not treat me despite not having said a word for these last two years - as he is the dentist, I expect him to tell me as we go along what the score is, not suddenly announce this condition and leave me worrying I will have no dentist and no teeth left!
And I already am incredibly self conscious over my less than perfect shiny smile, I had a very bad experience with gas/air as a child and it is a real valium job everytime I go as I have very sensitive teeth- so this kind of thing infuriates me, particularly when I read of people having to search for a dentist when they are in incredible pain and need.
Just my two pennies worth

S