http://tags.lifehacker.com/assets/base/img/thumbs140x140/io9.com.png http://io9.com/tag/dentistry http://io9.com/tag/dentistry These are bionengineered tooth crowns grown from pig cells that were implanted in a rat's stomach. Obviously a beta version resulted. But eventually scientists hope to use teeth like these in your mouth. Yum. Image by Douglas McFadd via Getty.

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