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You're speaking to Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply. Please be patient. This may take a few minutes.
I'm sorry that your question wasn't answered in a timely manner. We don't have many avian vets on this site. Can you upload a photo(s) of his beak to our conversation? You can use the paperclip icon in the toolbar above your message box (if you can see that icon) or you can use an external app such as dropbox.com/
I can be more accurate for you if I can see what you're seeing.
I've seen birds with loss of the entire lower beak still being able to eat normally. There's a good chance, however, that overgrowth of the opposing rhinotheca (upper beak) will need regular trimming by an avian vet (please see here: www.aav.org) at least until the gnathotheca (lower beak) grows out. Please respond with further questions or concerns if you wish.