So I got a video of him finishing eating a horn worm and you get to see the inside of his mouth. Now there's no black, he's not soar because of it, he's super active (like always on the go) eats lots drinks lots poops normal. He's himself happy, curious, adventures. But this seems to go away when he sheds then it comes back after a month Ish. Iv never been concerned because nothings ever changed in his behaviour or eating or even color he's always bright and happy never dark or angry. I took a wet qtip and very very gently wiped it, but I don't want to touch it with the wet qtips too much just in case. I'm booking a appointment with my herp vet just to be safe. But I can find anything that looks like it! And it looks like its covering his top teeth.