Do you usually floss before or after brushing your teeth? The American Dental Association (ADA) says:
It doesn’t matter when you floss; so long as you do a thorough job.
The ADA also says you should brush twice a day; and clean between your teeth with floss, or another interdental cleaner, at least once a day.
Uchenna Akosa, D.D.S., notes that flossing before you brush can actually leave you with a cleaner-feeling mouth, afterward, because it gives you the chance to brush away the gunk you pull out from between your teeth – instead of just letting some of the residue hang out in your mouth.
Brush up on more, here: (Yahoo)