"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." A sliver of what makes sharks so intriguing comes with their ability to regrow teeth. And while a group ...

For more than a century, dentistry has focused on repairing or replacing damaged teeth, not growing new ones. That assumption is now under direct challenge, as Japanese teams move a first-of-its-kind ...

Ghost sharks have evolved rows of true teeth on a bizarre forehead rod used for mating. Fossil and genetic evidence revealed the tenaculum’s teeth develop the same way as those inside the mouth, ...