April 19, 2012 5:34 am Study: No Link Between Gum and Heart Disease After hundreds of studies, the American Heart Association says the suspected link between gum and heart disease doesn’t exist. US & World Videos 1:02 Google productivity expert authors guide to boost wellness 2:23 Watch: Feeling and showing the impact of organ donation 1:07 Watch: Autism specialist discusses rise in children on the spectrum 1:10 Bay Area app monitors problems for people living with Parkinson's 1:43 Traces of bird flu virus found in 1 in 5 samples of pasteurized milk, FDA says