Novocain is a local anesthetic used to numb only a particular area of the mouth. Nitrous oxide is a conscious sedation that is used to minimize anxiety – when used, a patient will be awake and somewhat aware, but will often feel like they are floating. Intravenous, or IV sedation is a conscious sedation that is used to minimize anxiety and affect memory – when used, a patient will be asleep for part or all of the procedure and will often not remember the procedure at all.