I'm in a leo FaceBook group and this picture has come up in a post. It looks kind of like mouth rot. How long does it take to get bad though? She said she's had him since July last year and when she got him he was in a dirty tank but now keeps his tank very clean but his mouth still looks exactly the same. She seems like a nice person concerned about her gecko. Just trying to help the best I can. What advice would you guys give her? (He's had some trouble eating and the video of that is what started the conversation about mouth rot possibly) (https://www.facebook.com/BreeTreee/videos/848736495248522/)