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Israeli company Fluorinex Active has come up with a device that uses an electrical current to help keep cavities away. Using 6-9 volts of electricity, the fluoride-based gel that sits in the tray of the gadget is ionized, then forms a protective layer over your teeth that should last for 5 whole years.

Though it sounds tantalizing, we won't be seeing this technology for another year or two at least, but there is a battery-operated version on the horizon as well. I thought I saw something like this on one of those late night infomercials, but I must have been hallucinating.

Device fights tooth decay with electricity [CNET]