Dental sealants are a great tool for preventing cavities in hard-to-reach areas and on teeth that have deep crevices. They are typically recommended for children between ages 6 and 14, but patients of virtually all ages can benefit from their application. Dental sealants are made from specially designed dental resin or plastic. They are carefully applied in liquid form onto the back teeth in a thin layer. The sealant then quickly hardens and bonds directly onto the tooth, sometimes with the aid of a curing light. Sealants can remain effective for as long as a decade, but they still should be checked for wear during every dental check-up.