Dentinogenesis is the process of forming dentin, a hard tissue that makes up the bulk of a tooth beneath the enamel. This process begins during tooth development when specialized cells called odontoblasts produce a matrix of collagen and other proteins. As the matrix mineralizes, it transforms into dentin, providing strength and support to the tooth structure. The formation of dentin occurs in stages, starting with the secretion of the organic matrix, followed by mineralization. Dentin is essential for tooth function and health, as it protects the inner pulp and helps transmit sensations like temperature and pressure.