title: Placebo analgesia, endorphins, and naloxone.
mesh_terms: D000698:Analgesia; D000766:Anesthesia, Dental; D004336:Drug Antagonism; D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009270:Naloxone / Q000494:pharmacology*; D010149:Postoperative Pain / Q000517:prevention & control*; D010919:Placebos / Q000627:therapeutic use*; D014081:Tooth Extraction
chemical_list: D004723:Endorphins; D010919:Placebos; D009270:Naloxone