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The researchers described how their powder works. It is activated by electric toothbrush  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible, which create  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible electric fields over the teeth. These break down  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible-causing molecules. The researchers said their laboratory  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible were very  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible. They tested human teeth that were discoloured with  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible and coffee. After four hours of brushing, there was  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible whitening. After 12 hours of cleaning, the teeth were 50 per cent whiter than those brushed  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible. The researchers said the next  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible is to add the powder to  normallypromisingsmallstainstepteatoothpastetrialsvibrationsvisible.