At the time that acid etch bonding was first described by Buonocore in 1955 , bonding was a new technology, and a logical step in its use was the prevention of pit and fissure decay. The focus of Buonocore's work was the development of a sealant to prevent occlusal caries on posterior teeth.Thus, resin sealants were born. Acid treatment of enamel or dentin, whether a priory or concomitant bonding step, has been integrated into methods to retain materials and significantly reduce micro leakage at material tooth interfaces.