There used to be water jets which were integrated in the bathroom taps, but I expect these went out of favour because there would be a danger of turning on the tap too hard. I had a Panasonic battery operated one which didn't last very long, and since my last visit to the dentist, I've been using tiny tiny brushes which get a whole lot of gunge unwanted bits of food out.
Flossing before cleaning has now become a habit - the thought of polishing those crumbs if you don't get them out before brushing seems just daft.
I did love the water flossing method, though, and would like to hear of a reliable gadget to do it with, too. If possible, one where the water doesn't run down your arm in the process!!!