Solar Toothbrush
This new toothbrush design purportedly cleans your teeth better without toothpaste than the one you currently use (with toothpaste). It uses a titanium oxide embedded in the base of the bristled end of the brush to send out free electrons, which then react with the acid in your mouth, helping it break down the plaque. The electrons are activated when light shines on the titanium.
While silver nanoparticles seem to be taking over the world of antimicrobial plastics and fabrics, maybe this alternative way of killing bacteria by using electrons could give it some competition.
http://blog.wired.com/gadgets/2007/11/solar-toothbrus.html
more information at: http://blogs.zdnet.com/emergingtech/?p=754
