@olavf I don't know what the practice is today. Those friends I know who had it done, one of them recently, and my mother who had it done looong ago 1940s) had it done all in one go.
I'm 70, have had a few pulled, but am still running on original equipment. (fingers crossed).
@shuttersparks hopefully I can talk them into just getting the rest done. I'd really rather not do this over 3-4 sessions :/