I had one root canal and cap redone a year or so, due to something going odd down at the tip of the root. Since there isn't any more nerve in the root canal, there wasn't anything to cause pain. The dentist had an odd drill bit, rather like the ones used to drill for oil, in that it fit around the pin that was in place, and ground out enough of the root so that the pin could be removed with simple forceps. The noise of this sort of work it louder than other drilling so it may sound as if the dentist is trying to see what sort of nails are holding the heels of you shoes in, but there was little discomfort.

Obviously, since I had had the original procedure done forty odd years ago, by a dentist not far removed from the village blacksmith, the cost of the restoration was a lot more expensive than the original repair, but it was either that, or remove the tooth, not a viable option.

Dave