Yagi Studio//Getty ImagesA study out of Japan showed how targeting genes can regrow teeth in animals. Now, the team has turned to a human clinical trial. By targeting the USAG-1 gene, researchers believe that they can help people without a full set of teeth regrow teeth. The team says that humans have a third set of teeth available as buds, ready to grow as needed. A sliver of what makes sharks so intriguing comes with their ability to regrow teeth. And while a group of Japanese researchers aren...