This document discusses dentin bonding agents. It begins with an introduction noting that proper union between restorative materials and tooth structure is important, as gaps can lead to problems. The document then covers definitions, factors affecting bonding, conditioning and priming of dentin, the different generations of dentin bonding agents, and their mechanisms of action. It discusses the role of water and bonding in other clinical situations. The conclusion states that modern dentin bonding agents have improved through developments like the total etch technique, providing better bonding to dentin. Overall bonding outcomes are better but not yet ideal, and further clinical trials are still needed.