What movie or television show is this line from?

I remember either a movie or television show with a character saying, "Healthy teeth, healthy teeth, healthy teeth" to another character.

I believe the character saying the line was male, and I believe he said it three times in succession.

I'm not sure if the character was a dentist (although that would obviously make sense). And I'm not sure if the scene was about a person feeling anxious about going to the dentist and dreaming this scenario up.

It's not a recent film or show.

Any ideas?