Could your vet share the x-rays of the tooth root with Dr. Walsh? I think that might give him more insight. Why exactly does he think the jaw would be destabalized?
I have a 15 year old glider, and if she needed a tooth pulled, I would have the tooth pulled. You can't leave an abscess to just fester, you have to have it drained and flushed, so yes, he needs to go in. One of the largest causes of death in gliders is bacterial infection that is not treated, so I would not waste time in getting it lanced and drained and started on antibiotics.
Unfortunately, you are right. If there is tooth root involvement, then this will continue to happen over and over until the cause is addressed. If, however, there is not tooth root involvement (your x-rays will clear that up), then it still could be a recurrent issue, unfortunately. Facial abscesses are sometimes difficult to eliminate in gliders. I wouldn't let his age stop you from treating it appropriately.
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