Does relative analgesia work?
D000698:Analgesia; D000766:Anesthesia, Dental / Q000379:methods*; D001007:Anxiety / Q000517:prevention & control; D002648:Child; D006801:Humans; D009609:Nitrous Oxide; D010100:Oxygen; D013404:Suggestion
D009609:Nitrous Oxide; D010100:Oxygen