If You Can't Wiggum, Join 'em!
Wikisimpsons - The Simpsons Wiki
From Bart Simpson Comics 24 in the UK and Bart Simpson Comics #25 in the US
Plot
Ralph and his Dad go to an isotopes vs. Shelbyville game, where Chief Wiggum catches the ball in his mouth when Ralph opens it. In the end Ralph is a hero, and the Chief has teeth problems.