@Primorge: Yes, he's UDIM'd. I highly dislike stacked UVs. Such a pain to work with, but a necessary evil years ago.

One of his older mesh versions did have the traditonal "dentures" model for the mouth, with individually modeled teeth. The amount of additional geometry it added was insane, especially for something that's rarely seen, and they weren't even that detailed. I'm sure it would be a small task for someone to create individual teeth and parent or rig them if they really wanted to.