Cementum is a specialized bony substance covering the root of a tooth. In layers, the enamel being the top, the cementum would be the third to last. From top to bottom: enamel is first, dentin is next, cementum would would be next, then root, then pulp. Types of teeth Molars are used for grinding up foods Carnassials are used for slicing food. ... Tooth enamel is the most highly mineralized and hardest substance of the body . ... Parts of a tooth, including dentin Dentin (BE: dentine) is the substance between the enamel (substance in the crown) or cementum (substance in the root) of a tooth and the pulp chamber. ... The pulp of a tooth is the soft living tissue in the center of a tooth. ...