I do that if they are well worn(not extremely worn) and I plan on doing some work with the saw, but if I dull it cutting firewood then I just change them out. If you're changing out chains on a job that's not usually very productive.Pfff! Keep filing and cutting until a tooth or 2 snaps off. Or set aside for stumping.
This one hasn't lost a cutter yet, but one is angled up just a little.