For most people, brushing their teeth is a
way to keep cavities at bay—with the
pleasant side effects of a brighter smile and
fresh breath. But we've all occasionally
skipped the act before hitting the sack,
whether out of pure laziness or extreme
exhaustion. So how bad is it, really?
The short answer: It doesn't matter if you
brush your teeth right before bed. The most
important thing is that you're brushing your
teeth twice in a 24-hour period, says Kimberly
Harms, D.D.S., a dentist and spokesperson
for the American Dental Association.