They have found chemicals in the wine may reduce the ability of bacteria to cause cavities, gum disease and tooth decay.
Researchers in New York said both red wine grapes and the fermented seeds and skins left over from the winemaking process were high in these chemicals.
It is now thought a mouthwash could be made from the residue.
Red wine has long been known to contain a substance called resveratrol that helps protect the heart.
From the February 18, 2008, Prepared Foods e-Flash