Your teeth are comprised of three layers. The hard-outer layer you see is called your enamel, which protects the underlying dentin and pulp. Every day, your teeth are exposed to harmful bacteria that can erode your enamel, leading to a cavity. Although dental caries can be prevented, at least 92% of adults have had a cavity in a permanent tooth. If you’re prone to decay or you have weakened enamel, you can benefit from a protective barrier using dental sealants. While your dentist often recommends them for children, you’re never too old to benefit from their protection.