Scientists in China have found a way to grow teeth from human urine.

The scientists, from the Guangzhou Institutes of Biomedicine and Health, used human urine as a source for stem cells. Those stem cells were then harvested in a laboratory and mixed with other material. After roughly three weeks, the scientists said the cells turned into small, soft tooth-like structures.

“The tooth-like structure contained dental pulp, dentin, enamel space and enamel organ,” the researches wrote in Cell Regeneration Journal.

While the research won't immediately help replace teeth lost from old age or poor hygiene, researchers were optimistic it could lead towards “the final dream of total regeneration of human teeth for clinical therapy.”

But before you get too excited about the having your replacement teeth grown in urine, you should know that some experts aren't convinced this is the best option.

“It is probably one of the worst sources,” Professor Chris Mason, a stem cell scientist at University College London, told the BBC. “There are very few cells in the first place, and the efficiency of turning them into cells is very low. You just wouldn't do it this way.”

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