 Did you know you can regrow missing or damaged teeth with a tiny device that gives off a very specific frequency of ultrasound? Just like other great inventions, I wonder where this device disappeared to? So there was this guy, Ryan Smith, a hockey player who got a puck straight to his face while playing. That day, his smile changed forever. But hope was not lost. Things started to get interesting when researchers at the University of Alberta were onto something that could have saved smiles like Ryan's in the future. They discovered a way to regrow human teeth using ultrasound. Yeah, you heard that right. This genius named Tarek Elbialli was playing around with ultrasound on rabbits for something completely different when, bam, he noticed their teeth started growing like crazy. Then he thought, why not try this on humans? And guess what? It worked. People were growing new teeth in just a month by using this device for 20 minutes a day. The original machine was a beast. Too big to be practical.