@Veratai
The teeth are rendered using texture shifting. I also tested a method using two meshes, but ultimately determined that texture shifting was the better option.
@Veratai
I'm using a special material for teeth to define the tooth lines, so the number of materials has increased, but I think it has also increased the range of expression.
Teeth and tongue are not connected to the inside of the mouth, so they can be easily separated!
Pff okay, the idea to add teeth lines as a toggle, is really making every expression that much more amusing xD is the mouth mesh completely custom? Or are teeth and tongue easy to separate?