Hi,
One of our girls had a canine tooth removed. Hers was broken right up to the gum line. It was removed without problem. She had a pretty heavy general anasthetic for the op as apparently the canine tooth has a very large root. (I saw the root and it was twice as big as the removed tooth!)
We had to keep a close eye on it for a couple of weeks post op as a gaping hole is left behind (sometimes the vet may attempt to graft over the hole, as did my vet but it didnt take and the skin just fell away). Now she is absolutely fine. The hole eventually covers over and she eats whatever she likes including raw bones and rawhides. I would never have bothered with a cap, i really dont think it would effect your dogs quality of life at all. Cheers. I hope that helps. Good luck!