The first nationally representative analysis designed to determine how many people floss their teeth found that those who floss daily amount to 30 percent of the population. Just over 37 percent report less than daily flossing; slightly over 32 percent say they never floss. -- https://www.usnews.com/news/articles/2016-05-02/how-many-ame...
And if you asked me to estimate the % as a kid, based on how my parents treated not flossing (as much an offense as swearing), I would say... maybe 5% don't floss.
I'm fascinated by the delta between what's typical, and what I grew up thinking typical is.
