Mine just got her 2nd look-see since the dentist mentioned it, and I’ve got her on Previcox again. I’m also soaking all her grain, and being picky about hay. She’s not a candidate to have any pulled, so I’m keeping a close eye on her comfort level. No hay nets, and all hay gets shaken out, she’s definitely ouchy grabbing with her incisors. I make sure she gets plenty of options for eating, since it takes her a little bit longer to eat all her hay.
She had a HUGE drop in body condition before her teeth were due, and before I put her back on the Previcox. I’d say a month to look relatively terrible. She now eats more grain than she’s ever needed to before, and her gut was pretty upset for a while from the poorly masticated hay. I do stress about her pain management, though. She’s extremely stoic. 
I took care of one older guy who had no top incisors, and he did just fine! I guess healing is pretty simple, and once the teeth are gone they bounce back pretty quickly.