Well, i wanted the same thing but couldn't find any mouths so i had to resort to making my own (I didn't like the way that all of them were always smiling) but I can give you mine in an attachment if you give me your email, and if you don't want to send it to me publicly as a post then just email me...

Thanks, that was the problem, it was at 1 not zero

Why won't it let me add bones to my character, I created it in moho and it is a bone layer, but it won't let me add bones.