An odontoblast's a biological cell of neural crest origin that's part of the outer surface of the dental pulp, and whose biological function's dentinogenesis, which's the creation of dentin, the substance under the tooth enamel. Odontoblasts first appear at sites of tooth development at 17-18 weeks in utero and remain present until death unless killed by bacterial or chemical attack, or indirectly through other means (for example being aspirated into dentinal tubules by the use of a turbine hand… (More on Odontoblast)