It does. It really does. Flossing can save your life, help your gums, and so much more. I don’t know all of the details, but I’d suggest talking to your dentist for a better answer.
Absolutely! It strengthens your gums. While I had braces, I never flossed, and my gums lowered and became irritated. After flossing again, I definitely noticed a change in my gums and it isn’t as painful when brushing.