These materials include sealants, composite resin, and glass ionomers. These are all polymers of some type and can be used in both primary and permanent teeth. I know that some controversy surrounds the use of dental sealants. Some people are concerned about the release of so-called estrogen type compounds in sealants. As of December 1999, I am not aware of any scientific studies that prove sealants are harmful.
Sealants can be a wonderful preventative treatment.
However, they should be considered on a case by case basis. Those with deep pits and grooves which are unreachable by toothbrush bristles can greatly benefit from sealants. Sealants have been available since the 1970s. I place sealants when I feel they will be helpful in preventing dental decay. Until I read scientific evidence that plastic materials, including sealants, are dangerous for patients, I will continue to use them.