First off welcome to the forum - glad u found us!
1 100% agree with sugarcatmom here....I'm also not convinced this vet has the most experience with this matter. How many years of experience does this vet have? I too would very likely get a second opinion at another vet..and that second opinion would come from a recommendation only.
If this were my cat, those abscessed teeth would be extracted.
I would never euthanize a cat for this, I would do the extractions and pray that the cat makes it...
- If the cat makes it you've saved her life and given her quality of life.
- If the cat does not make it, then you've tried your best to help her.
Good luck and please update us.