buffalo tooth implant

Cementum
Main article: Cementum

Cementum is a specialized bony substance covering the root of a tooth.[12] It is approximately 45% inorganic material (mainly hydroxyapatite), 33% organic material (mainly collagen) and 22% water. Cementum is excreted by cementoblasts within the root of the tooth and is thickest at the root apex. Its coloration is yellowish and it is softer than either dentin or enamel. The principal role of cementum is to serve as a medium by which the periodontal ligaments can attach to the tooth for stability. At the cementoenamel junction, the cementum is acellular due to its lack of cellular components, and this acellular type covers at least ⅔ of the root.[16] The more permeable form of cementum, cellular cementum, covers about ⅓ of the root apex.[17]
Pulp
Main article: Pulp (tooth)

The dental pulp is the central part of the tooth filled with soft connective tissue.[13] This tissue contains blood vessels and nerves that enter the tooth from a hole at the apex of the root.[18] Along the border between the dentin and the pulp are odontoblasts, which initiate the formation of dentin.[13] Other cells in the pulp include fibroblasts, preodontoblasts, macrophages and T lymphocytes.[19] The pulp is commonly called "the nerve" of the tooth.