Scientists must really dread the dentist -- they're always coming up with new solutions to help people avoid that cursed drill. The latest: a hormone gel that regenerates tooth cells in as little as a month.
The gel, the first of its kind, could eliminate the need to fill cavities or drill into the root canal of an infected tooth, Discovery News reports. It is reported in the journal ACS Nano.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.