Rules adopted by the board under this subchapter do not apply to:
(1) the regional injection of an anesthetic to reduce or eliminate sensation, especially pain, in one part of the body; or
(2) the administration of anxiolytics and analgesics that are not being used in conjunction with the administration of nitrous oxide and that are administered in doses that do not have the probability of placing the dental patient at risk for loss of the dental patient’s life-preserving protective reflexes.