The Chinese team gathered cells -- such as those that line the urinary tract -- found in urine and coaxed the cells into becoming stem cells, which are cells that can grow into any type of tissue. A mixture of the cells and other material were implanted in mice, BBC News reported.
Within three weeks, there were tooth-like structures. However, they were not as hard as natural teeth, according to the study in Cell Regeneration Journal.
This research won't immediately lead to the regeneration of teeth for patients, but could be a step in that direction, said the scientists at the Guangzhou Institutes of Biomedicine and Health.
One expert wasn't impressed with the study, saying that urine was a poor starting point for creating new teeth.
"It is probably one of the worst sources, there are very few cells in the first place and the efficiency of turning them into stem cells is very low," Professor Chris Mason, a stem cell scientist at University College London in the U.K., told BBC News. "You just wouldn't do it in this way."
NYC Ban on Large Sodas Struck Down by Appeals Court
New York City's ban on large sodas has been struck down by an appeals court.
In a unanimous decision, the four-judge panel of the state Supreme Court Appellate Division said that the city's Board of Health exceeded its legal authority and acted unconstitutionally when it moved to limit the size of sodas and other sugary beverages served in restaurants and other food outlets, CBS News/Associated Press reported.
While the health board has the power to ban "inherently harmful" food and beverage products from being served to the public, sugary drinks don't fall into that category, the judges said.
The city plans a quick appeal.
"Today's decision is a temporary setback, and we plan to appeal this decision as we continue the fight against the obesity epidemic," Mayor Michael Bloomberg said in a statement, CBS News/AP reported.
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