Mice Floss

Alright, listen up, chucklehead! So, mice gotta clean their chompers just like you (though, judging by your jokes, maybe you don't). "String cheese" sounds like "string" which people use to floss. Get it? It's funny because mice using cheese as floss is ridiculous. You probably think cheese is only for eating, but, hey, maybe you should try flossing with it. Might improve your breath and your humor!