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Hello. Thanks for the question.
It is possible that there is another tooth that is bothering her. I recommend full mouth x-rays when a dental is done. Most teeth that have pathology will have it below the gum line. You cannot see this just by looking at the teeth. Once we see the pathology above the gum line or the tooth is loose, these are significantly diseased teeth. Those should have been removed long before.
I would get a second opinion by another vet or a veterinary dentist to see if they can get this resolved once and for all.
Best of luck, let me know if you have any other questions.
Ouch, ulcers in the mouth would definitely cause these signs.
These can be hard to diagnose the underlying cause. It could be secondary to bacteria in the mouth, wounds in the mouth, kidney disease (uremic ulcers) or auto-immune.
I usually treat with antibiotics and pain meds. If no improvement, I'll do bloodwork and biopsy the lesions to get an answer. Hopefully that is not needed and it clears with the pain meds and Prednisone.