Dr. Kunio Komiyama and his colleague Dr. Gerry Uswak are testing 120 Canadian teenagers willing to brush with the solar powered toothbrush and go to the dentist more frequently to document the effectiveness of the toothbrush.

The Soladey  only needs about as much light as a solar calculator.  Although the tests on the new model are ongoing, lab tests showed complete destruction of two types of bacteria which are major culprits in periodontal disease.

via themoderngreen.com