So you mean that I should make a layer for the hole which is the throat and another one for the lips? I had that idea but I thought you could do it simpler because when you make it another shape for the switch layers you have to modify both layers, is it that right?

Hello everybody, I was trying to do add a mask to a mouth, I know the usual process for simple mouth shapes, but the mouth I've drawn contains coloured upper and lower lips. The problem here is when I mask it you can see the teeth between the lips so they become transparent but I want them be shown ...