title: [Root canal therapy without pain].
mesh_terms: D000287:Administration, Topical; D000766:Anesthesia, Dental; D000769:Anesthesia, Inhalation; D000772:Anesthesia, Local; D006801:Humans; D009609:Nitrous Oxide; D012390:Root Canal Therapy
chemical_list: D009609:Nitrous Oxide