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For those with pasty white gums, this Soladey solar-powered toothbrush will provide a loving bronzing that even George Hamilton's dentist will love. Or it will convert light into negative ions to attract positive ions from acidic dental plaque or something—it's Japanese; I hold myself to no accuracy. It's part of a selection of green hygiene products on Treehugger, including a prototype ceramic-bladed razor that wouldn't have needed sharping or replacement blades, but was rubbed out when it was discovered to allow cars to travel 200 miles on just a single gallon of gas.

Top Five - Personal Care [TreeHugger]