How to Make Clay Replacement Mouths for
Stop Motion Puppets
Replacement mouths are a good way to animate the face of your puppet so it appears to speak. It also saves you time when you don't want to re-sculpt the mouth for every frame of animation. This video covers a few advanced tricks where you sculpt and mold faces to animate. Then Marc demonstrates how you animate them.
Jack Skellington replacement heads from the Nightmare Before Christmas