#root_canal  the passage in the root of a tooth through which its nerve and blood vessels enter the pulp cavity
  supertype:  passage.anatomical_structure__passageway  a path or channel or duct through or along which something may pass; "the nasal passages"
  part of:  pulp_cavity  the central cavity of a tooth containing the pulp (including the root canal)
     part of:  tooth  hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense

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