Researchers may have found a way to harness beneficial bacteria such as probiotics to help prevent cavities in children.  Céline Lévesque, a professor in the University of Toronto’s Faculty of Dentistry, and her team are using synbiotics – a mixture of probiotics and prebiotics that work together in the body’s digestive tract – to address one of the main challenges in applying the health-promoting effects of beneficial bacteria on teeth: they don’t remain in the mouth long enough to be effective.