I made actually two folders in the switch layer, which contain the mouth with the 'O' and one layer with the teeth. By masking only the teeth are visible, which is the intention. But then the Interpolate sub-layers doesn't work anymore.
If only one vector layer is possible, is there a trick for the teeth or do I just have to move the vector points to the edge of the lip? That would be a problem, as I use Blend Morphs to turn the head. The tooth will at some point then go outside of the mouth.
