I would not let a toddler be sedated in a dentist office. One of our kids had anesthesia for ear tubes, but done in a hospital, of course. I, myself, have IV sedation at a dentist office for certain procedures, but would never allow my children do it (unless they were an adult).
My dad worked as an RN Anesthetist for nearly 50 years. He said you are never closer to death than when you are sedated. He was fully aware of everything that could go wrong during sedation and HE would never have let any of his grandkids be sedated in a dentist office, where they do not have the resources to draw from if something goes wrong.
We did extensive work on our 3 boys that we adopted from Russia (and had never even seen a toothbrush so you can only imagine what we faced) starting at age 4 including extractions, caps, spacers, fillings, etc. None of them were sedated. We did it using gas/Novocaine and in small chunks over many appointments. None of them are scared to go to the dentist based on that experience and they are now 16, 18, and 20.
Good luck.