Season 9, Episode 6: "The Merv Griffin Show"

We have to talk.

-Oh, right. -Stop it.

-You've gotta stop using these. -Why?

Because they're turning your teeth green.

I only buy the white ones.

Okay. Well, then your teeth are green for a different reason.

You gotta stop carrying these, okay? Just use mouthwash.

I can't. It burns my cankers.