This document discusses dental pit and fissure sealants. It begins by explaining that pits and fissures are highly susceptible to tooth decay, accounting for a disproportionate amount of cavities despite being a small surface area. The concept section defines pit and fissure sealants as resin materials that are bonded to etched enamel pits and fissures to prevent decay. The document provides a detailed history of sealant development and classifications. It discusses the morphology of pits and fissures, the sealant application procedure, requirements of sealant materials, age ranges for application, indications and contraindications. The importance of patient education on sealants is also covered.