Brushing and flossing are the best ways to help prevent cavities, but it's not always easy to clean every nook and cranny of your teeth, especially the back molars. Molars are rough, uneven and a favorite place for leftover food and cavity causing bacteria to hide. Don’t worry, there is another safety net to keep those teeth clean. It's called a sealant. A sealant is a thin, protective coating that adheres to the chewing surface of your back teeth. The best news is that it is a quick and painless preventative service. In fact, studies show that sealants reduce the risk of decay by nearly 80% in molars.