I found something.
2 seconds sound clip from the Rudolph the Red-Nosed Reindeer and the Island of Misfit Toys movie soundboard.
You can hear this line at 00:40:57.122 in the DVD version of the movie.
Quote context
[...]
- Actually, I'm a dentist now.
- Dentist, schmentrist, you no-account rebel!
- You left my staff one elf short!
- You'd better be nice. One of these days, you'll need a dentist and I'm the only one around.
- I wouldn't let you touch my choppers with a 10-foot pole, you tooth maniac!
- Why, that's just toy stuffing!
- Oh, it's stuffing, all right.
- We stopped using this kind years ago.
[...]