Extra info I guess?
I'm unsure if I can edit a post. I wanted to make sure he's not sick or anything, but might it have something to do with that he hasn't been using his front teeth too much? After getting his bottom teeth trimmed, he didn't seem to like it too much, and I noticed he at first even struggled to eat, and used his paws to get his food in his mouth. (He is eating fine now, he's actually eating food right now.)
Mid writing this, I realize he has been eating with his front teeth some, like he ate a slice of apple today. He's definitely getting better on that, but I'm not too sure if it means anything on why they're clear.