Enamel is the material that forms the outer protective layer of our teeth. It is the hardest substance in our bodies. Dentin is the material under our enamel and composes the bulk of the tooth underneath the harder outer enamel layer. Although dentin is softer than enamel, it is the second hardest material in our bodies, even harder than bone. Enamel, however, is vulnerable to something that can pierce through it if given enough time. Acids produced by bacteria and often present in some foods and drinks will dissolve the enamel. Once an opening occurs in the enamel, bacteria have a higher chance of invading the more porous dentin underneath and injuring the pulp (nerve and blood supply to the tooth). This is why it is important to place sealants on enamel grooves that have never been restored. Many insurance companies will not pay for sealants on adult teeth. This is not because it is not a worthwhile procedure to do. Just the opposite is true. Sealants reduce the chance that decay will occur in the gro ...