A genuine smile can be a powerful thing. OF course everyone wants bright white teeth. But the benefits of a beautiful smile are more than just cosmetic. Researchers have found links between poor oral health and conditions that involve the heart, the brain, and other parts of the body all the more reason to give your kisser the best care possible.  You still need to floss Flossing made headlines earlier this year when an Associated Press report claimed that research shows little evidence it’s worth your while. But don’t quit the habit just yet, says Wayne Aldredge, DMD, president of the American Academy of Periodontology. “All the studies they looked at were of short duration, some as little as two…