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[–] [deleted] 1 point 1 point (+2|-1) ago 

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[–] 20403370? ago 

"The team then applied their clusters to human teeth which had been exposed to acid. They discovered that within 48 hours the clusters had given rise to a crystalline layer, about 2.7 micrometres thick, with the complex, fish-scales-like structure of the underlying natural enamel."