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dentistry dentin development of tooth bud stage dental lamina dental follicle how does a tooth form tooth formation hypoplasia supernumerary teeth hypodontia anodontia multiple teeth tooth bud sodium hypochlorite chlorhexidene edta calcium hydroxide zinc oxide eugenol biocompatibility restorative material dentinoenamel junction hunter schreger bands dentinal tubules dentinal fluid odontoblast dentinal hypersensitivity incremental lines of von ebner types of dentin