So a few years ago tooth #10 had to have a root canal (the one between the front tooth and the canine) and after i had it done, an abscess
formed on the gum above the tooth
and I had to go back in (don't know if they redid the root canal; do they do that to fix an abscess?) in any case, it hurt a lot for a long time after the root canal, but eventually it calmed down.
A few months ago, the tooth started hurting again.