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How can a product that is "tailor-made to fit into a person's mouth using 3D scanning and 3D printing" be sold refurbished?

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I assume they mean that your previous one can be refurb'd with new bristles, rather than it being someone else's.

Although "refurbished" wouldn't be the right word, I took it to mean that they would print out a new one for you, having already created the 3D model.

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