[Frondo]

Heh, anecdotally, I used to get a couple cavities a year, pretty consistently, never flossed. I started flossing religiously a few years ago, and after a week of spitting blood out in the sink afterward, I got used to it. Haven't had one since.

[glandium]

Anecdotally, my wife has been flossing forever and has cavities all over the place. I, on the other hand, never ever flossed, rarely brush my teeth more than once a day, and have no cavities.