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Why not? Brushing and swishing removes most of the particles, and then you floss to reach the tight spaces.

Because when you floss you create more particles

Doesn't rinsing your mouth out with water solve this?

Nowadays the advice is not to rinse so you don't rinse away the fluroide from the toothpaste.

I can’t imagine not rinsing after brushing, with your mouth full of toothpaste