QuicklyStarfish comments on Harry Potter and the Methods of Rationality discussion thread, part 13, chapter 81 - Less Wrong
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In Ch 45, Harry thinks:
If this is true, it's possible that as long as death exists (for wizards, anyway), it will continue to cast its shadows, and so the dementors can never be all destroyed. Maybe they'll just respawn or something. In fact, maybe when Harry destroyed that one in Ch 45, a dementor respawned back at Azkaban without anyone noticing. Do the guards keep a count of dementors?
That's an interesting possibility, but I favour the interpretation that this is the source of dementors:
It fits very nicely. Dementors (Death) were unkillable (undismissable) because the "true" patronus charm (counterspell) had been lost.
Canon makes reference to fog being produced by dementors breeding, which doesn't sound like a light ritual or a respawning option. I don't know if Yudkowsky has kept this part.