To make the replaceable mouths for my character I used super sculpey firm.
Using the heads I cast I placed sculpey in the mouth section and moulded it into shape
I then sculpted the basic mouth shape I needed
Here are some examples
once I had the basic sculpts and mouth positions I took pictures of the head and mouths to make sure they all worked and were in the right place. Any adjustments needed were made here. The top teeth need to remain in the same place that is the most important thing to have right. Once I was happy I added final details and baked the mouths to harden them
Here are some of the mouth pieces after baking the next stage will be to paint them