Fake teeth may soon be a thing of the past. Led by bioengineers at Harvard University, researchers have discovered a way to regrow a major component of pearly whites with light shined from lasers, USA Today reports. After creating small defects in the teeth of rats, the team beamed lasers on the dental flaws to activate growth. Twelve weeks later, dentin—a hard tissue that makes up the core of teeth—had formed. Described this week in Science Translational Medicine, the technique could be applied to growing other organs, such as livers and hearts.