Using the same small piece of floss for all your teeth actually spreads bacteria, etc. throughout your mouth, causing all the things you're trying to avoid by f

Using the same small piece of floss for all your teeth actually spreads bacteria, etc. throughout your mouth, causing all the things you're trying to avoid by flossing in the first place. Citation needed; I've heard this one before, and I just don't buy it. I've always believed (perhaps wrongly) that flossing was meant to remove food debris the bacteria lives off of that a toothbrush can't get to. Dentists & hygienists never floss two sets of teeth with the same piece of floss. (And yes, they go through a crap-ton of floss.) Maybe my hygienist is doing it wrong, but she uses very little floss and uses the same piece for multiple tooth gaps.