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Can they use the carbon to self-replicate yet? That's when things get interesting.

If you have carbon based machines replicating on your teeth, isn’t that just more plaque?

I believe they are making an allusion to Grey Goo [0]

We are grey goo. If you don’t mind it in musical form: https://youtu.be/ObvxPSQNMGc

As long as the machines don't produce acid that should be fine.