IMPORTANT THING TO KNOW:Most of the models I make will have a 2d mouth so that way you can make other expressions. You don't have to use my mouth and can use your own mouth rig if you wish but I suggest you should stick with it. You will need my 2d Mouth Maker that was made in Blockbench in order to make your own mouths, HOWEVER when you do, IF you make a mouth that is open like a smile or anything you have to color the inside white with the opacity lowered to 7% so that way you can see on the inside and not have to worry about drawing teeth. Also in Mine-Imator make sure it's flat and adjust the render depth when you need to. When you make your expression the outside can be normal opacity, only make it opacity 7% if the mouth is open.
I will be creating more Poppy Playtime models sometime this year. (Including Huggy Wuggy, Poppy, Doey, Catnap, etc)
https://www.mediafire.com/file/abjyv5d5cquv508/Lily_Lovebraids.zip/file
https://www.mediafire.com/file/jt4bfqycbj4nbmq/2d_Mouth_Maker.zip/file