Soladey-eco Ionic Toothbrush is revolutionary. Inside the handle there’s a light-activated titanium rod, which is a semiconductor. When exposed to light (a plain light bulb, a fluorescent tube or daylight), the rod releases negative ions, which pull positive ions from the plaque on your teeth, and the plaque disintegrates. To brush your teeth, moisten the brush and rod (saliva is sufficient outdoors) then brush the teeth lightly but thoroughly; force is not necessary. Your saliva foams lightly when the toothbrush is working effectively. If toothpaste is used, it should only be very little. The brush head should be replaced at least every 2 to 3 months.