A new study shows that stem cells extracted from urine can be turned into rudimentary tooth-like structures. Oh, and the researchers did so by growing the teeth inside the kidneys of mice.

To make the teeth, Duanqing Pei, who works at the Chinese Academy of Sciences in Guangzhou, mixed the stem cells with the connective tissue cells of mice. This concoction was grown for two days prior to being implanted under the outer layer of a mouse’s kidney. Once there, the cells were coaxed into becoming dental epithelial tissue, and eventually enamel.

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