It has an effect on gum health, which is far more important for the integrity of your teeth and overall health than some superficial crevices that can be filled

It has an effect on gum health, which is far more important for the integrity of your teeth and overall health than some superficial crevices that can be filled. EDIT: Also, we understand the mechanism by which food left in the teeth contributes to gum disease very well. I'm all for demanding high quality epidemiological evidence when we just have a hunch about things, because we deserve at least some correlational power to any claim, but the way in which this data is collected by something as difficult to monitor, annoying to some people, and socially pressured as oral hygiene is deservedly suspect IMHO given our direct clinical knowledge of the health matter in question: it's aetiology, progression, and reversal, on an observable level per organism is very well understood by modern dentistry, AFAIK.