I know what you mean... the same dentist I've hit (his office is hidden in an arcade and can't be found unless someone draws a map, even though he's well accredited), for over ten years has nagged me about purchasing specially patented flossing systems and such because, "it would be a shame if you developed a dental problem...) aka, be proactive. I keep asking him to show me the cavity or abscess as proof. It pisses him off, I pay my 50 bucks for the cleaning service, and he scratches his head with fury.
His various first year dental assistants rotating in and out of the door have uttered numerous times in surprise..."he has perfect teeth" and were chided by him.
I brush 1-2 times per day, dependent on diet... and that's it.
But like you mentioned.... no sodas, few juices, no sweets... and plenty of water.
Mum grew up with horrible teeth problems... that sort of spells out where diet succeeds.