I really don't know enough about this to give good advice, but good luck! poor Dusty.. he is pretty young still, so maybe a root canal would work? It depends if you're willing to spend extra money and have him go through a longer recovery.

Gonzo slightly chipped one of his top molars last year, but only on the outside... it was also probably from a bone . His vet said its fine now, and doesn't hurt him at all, but she said she might have to pull it in a couple years