I certainly agree that a physician’s advice should be sought to fully understand all possible complications and risks.
From what I’ve been reading and hearing in conversations with my dentist, nitrous oxide is not used as an anesthetic, and is generally mixed with oxygen. Its use in dentistry was tailored to calm nervous and or over stimulated minds, so as to make a dental procedure easier and less traumatic for both. Patients would rarely sleep under its influence, in fact, the dental practitioner wants the patient awake for feedback during the procedure.
As I recall from my dental visits as a youth, the only memories I have of nitrous oxide use, I never felt as though I would fall asleep. With the mixture I was given, the experience was more like I had been given a light stimulant, while feeling disconnected from my body and being totally ok with the prospect.
The delivery system I envision would rely on a single mixture to reduced the possibility of a mixture control failure. It would also only be operational for limited time periods, reducing the dangers of an overdose. I realize there is not a single medical device, or procedure that is foolproof. It all comes down to risk vs reward.