It seems that nowhere else in the medical world, is it legal for a doctor to administer anesthesia to a patient, and then simultaneously begin working on them as well. This “single operator,” model exists only in dentistry. And dental boards around the country are beginning to question why this is the case.

This particular case in California gives more information: http://www.nbcbayarea.com/news/local/Changes-To-Dental-Anesthesia-Lie-Ahead-405115246.html