I was watching the "Jack Goes to Dentist" (https://threescompany.fandom.com/wiki/Jack_Goes_to_the_Dentist) episode from Season 7 earlier today, and that was the first time that I heard about pericoronitis (https://my.clevelandclinic.org/health/diseases/24142-pericoronitis), which Phil, the dentist (played by Jeffrey Tambor (https://www.reddit.com/r/threescompany/comments/1emi5tt/jeffrey_tambor/)) diagnoses Jack as having (https://transcripts.foreverdreaming.org/viewtopic.php?t=66910) and is what is causing his toothache.