I don't fucking know and I don't give a shit. I have never watched any behind the scenes shit. What I have watched is the original movie, both on original pre-digital TV airing and on VHS, and she had braces and that was the joke of the scene. They both have metal teeth.
I've read a claim that there's a continuity error where the actress doesn't have braces later in the same movie and that would explain their removal from later releases. Not gonna bother checking if that's true or not, it makes enough sense for me.