ION-Sei sonic toothbrush from Japan - with ion technology against bacteria
ION-Sei's innovative, patented technology not only removes the plaque, but also works against the bacteria that form the plaque. ION-Sei works with a magnetic titanium dioxide rod. This rod, in conjunction with UV light, generates negatively charged ions, an electrical microcurrent (photocatalysis).
The natural charge of teeth and plaque is also negative, but our saliva contains positively charged ions. The difference in charge causes plaque to stick to teeth. The negative microcurrent generated by the titanium dioxide rod cancels out the charge difference. Positive ions cannot adhere to the teeth.