We took the cats in for dental exams today. Kerrigan is OK, but Ari had to have a canine tooth removed (it was infected). He has pain meds and antibiotics for the extraction, and we're going to have to soften his dry food for a week, but they said he should be OK. We'll have to take him back in in about ten days to see how the extraction site's doing.
So I guess he'll be "Ari One-Fang" from now on. :)