Sealants are a thin coating that is painted on groovy surfaces of teeth to protect them from cavities. Sealants are very effective because they form an extra barrier between cavity-causing bacteria and your child's teeth, especially for back molars that are harder to clean. Sealants have been shown to reduce the risk of decay by nearly 80% in molars. School-age children without sealants have almost three times more cavities than children with sealants. Once we place sealants, we check them at every visit to make sure they are intact and make repairs as needed.