Episode name reference to/pun on: The idiom "Pain in the neck"
April 29, 1998
Pain in the Mouth is the second part of the 37th episode in season 2 of Dexter's Laboratory, which first aired on April 29, 1998. In this episode, Krunk gets a toothache from eating chips, and The Justice Friends all try to help him get rid of it.
Major Glory plays 'dentist' while Krunk had a tooth ache by eating chips.
Krunk is eating chips while watching the Puppet Pals show and he gets one stuck in his tooth and Major Glory tries his hands at dentistry. Valhallen warns against it because he doesn't know what he's doing and insists they take Krunk to the dentist. Major Glory balks at the idea and fights with Valhallen about it. While both the superheroes and supervillains try to remove it, Valhallen accuses him of being afraid in doing the right thing and take Krunk to the dentist to fix the problem. Major Glory tells Valhallen to stop talking about dentists because he has a fear of them and also is sick of the rocker singer hero of telling him what to do. While they argued, Krunk decides to visit the dentist after remembering what he learned from his favorite show. In the end, the dentist is able to get the chip removed from his teeth and Major Glory pays the price for the lack of care for his own dental hygiene.