Difficulties in achieving local anesthesia.
D000766:Anesthesia, Dental / Q000379:methods* / Q000523:psychology; D000771:Anesthesia, Intravenous; D000772:Anesthesia, Local / Q000379:methods* / Q000523:psychology; D001007:Anxiety; D006801:Humans; D009609:Nitrous Oxide; D011229:Preanesthetic Medication; D011795:Surveys and Questionnaires; D014861:Washington
D009609:Nitrous Oxide