My 2nd son was 11m/o when his four top front teeth were extracted and the two top premolars were capped. It was horrifying he couldn't be sedated due to his age an d medical history in my family. He is a large boy too so he broke free of the papoose at first, I had to help strap him in and hold his head still, for years he wouldn't go back to a dentist. If your family history is one of having heart or breathing problems I wouldn't sedate. but if you don't sedation leaves the child less traumatized by the experience.
Unfortunately, do admit that nursing has no only benifits not detriments to your childs teeth! Even if you nurse at night, it's not like they're having a bottle leaking and pooling in their mouth all night! when you "let down" the child swallows the milk and it's done, no pools of milk. I nursed our first son until he was 3. Our second I weaned at 11 months due to his teeth - not because I wanted to, but he was in so much pain he went straight to drinking out of a cup. Our third son I am nursing now in the 9th month and plan to nurse as long as is still interested ( I say this be cause he's already showing signs of self weaning).
Our first son's teeth have some cavaties but not a lot. Our 2nd has poor teeth, they've determined that the teeth had weak enamle to start with! and our newest addition we'll see. His teeth came in the latest (4mo with the first 2, 7mo with him).
Teeth are as much a part of the genetic roulette wheel as the rest of us. If you and your childrens father have dental issues your children will more than likely.
Good luck and the strenght of all mothers be with you!!!