Scientists have long known that frogs are oddballs when it comes to teeth. Some have tiny teeth on their upper jaws and the roof of their mouths while others sport fanglike structures. Some species are completely toothless. And only one frog, out of the more-than 7,000 species, has true teeth on both upper and lower jaws.
Click here for original story, Taking a bite out of tooth evolution: Frogs have lost teeth more than 20 times
Source: Phys.org