It is, in fact, the episode in which Jerry's gentile dentist annoys him by attempting to become Jewish and peppering his dialog with Yiddish.
Jerry: All right, that's enough. Now get going. Get outta here. (Tim and his staff enter)
George: Hey, Tim. Quick question. Is it normal for your teeth to make noises, like a hissing or a chirping?
Jerry: George...
Tim: Um...
George: Fine, I'll make an appointment. (He leaves)
Tim: All right, it is cavity time. Ah, here we go. Which reminds me, did you here the one about the rabbi and the farmer's daughter? Huh?
Jerry: Hey.
Tim: Those aren't mahtzah balls.
Jerry: Tim, do you think you should be making jokes like that?
Tim: Why not? I'm Jewish, remember?
Jerry: I know, but...
Tim: Jerry, it's our sense of humor that sustained us as a people for 3000 years.
Jerry: 5000.
Tim: 5000, even better. Okay, Chrissie. Give me a schtickle of flouride.