One out of every three people don’t. That’s according to a new report from the CDC. They asked over 9,000 people how many days a week they flossed their teeth. One in three said “never.” One in three said “just once a week” – and the last third were daily flossers. Now, that’s probably not a surprise to most dentists. But if you’re in the “never floss” group, the tartar buildup could eventually attack your teeth and gums, causing your teeth to fall out. To keep your teeth, the American Dental Association says you should floss at least once a week.