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Should you floss before or after you brush? There's a lot of debate about this, and finally an answer from those that know. And the answer is....either way is good, just so you do floss every day. Even the American Dental Association says whether to floss or brush first is up to you, noting that, "either way is acceptable as long as you do a thorough job." What the ADA does recommend, though, is that you brush twice a day and clean between your teeth with floss or another interdental cleaner (e.g. a soft toothpick) at least once a day.
My method is floss before I brush...that way all the big particles of food are gone before I polish up my chompers.
There are even a songs about it...