The plastic materials used in dental sealants don't contain BPA. However, the plastic compounds can create BPA when exposed to saliva. Even so, research has shown that children are exposed to exponentially more BPA in the food and drink they consume than from their dental sealants.
A 2016 study referenced by the American Dental Association showed that the amount of BPA created by dental sealants was well below the proposed daily limit.
More studies are needed to fully understand the effects of low-level BPA exposure. The benefits of dental sealants, however, have been proven repeatedly.