What are the benefits of flossing? But I mean, visible ones. I’ve not been flossing for more then 10 years and nothing happened.

Jobst P.
There may not be huge visible signs of flossing (or not) but it's a big health risk. Miniscule food gets stuck in between teeth and in gums and if not removed, can rot out areas and create cavities or soft spots. If you are brushing pretty well then you may get most of the excess debris out, but you can't always tell.