Dentin

Dentin is a calcified material that forms most of the tooth substance

Dentin lies deep to the enamel and cementum. It contains less hydroxyapatite than enamel, about 70%, but more than is found in bone and cementum. Dentin is secreted by odontoblasts that form an epithelial layer over the inner surface of the dentin, i.e., the surface that is in

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