I'm getting a root canal.
In the same tooth.
Actually, it's not actually a root canal. It's something far grosser and more complicated. I can't really explain -- I spelled it so badly when I wrote it down at the dentist that even the Google can't figure it out. Anyway, apparently I'm part of the five percent of people who have failed root canals.
If you'd like, you can read more about past tooth troubles.