 Together, these items constitute the dental pulp.Endodontic therapy involves the "removal" of these structures, disinfection and the subsequent shaping, cleaning, and decontamination of the hollows with small files and irrigating solutions, and the "obturation" (filling) of the decontaminated canals.Filling of the cleaned and decontaminated canals is done with an inert filling such as gutta-percha and typically a Zinc oxide eugenol-based cement.