I can't speak to the first question as I have no experience with it, but many of my old guys have wound up toothless and it has absolutely no effect beyond chewing bones etc. They even were happy eating kibble and treats (inhalers of food to a dog ). If it means being pain free for the rest of her life, that's what I'd do. Recovery can be a bit rough, but is short. Sending a ton of toofie your way!