The Soladey-3 is the most recent iteration of a unique ionic toothbrush invented by Dr. Yoshinori Nakagawa, and millions are sold in Japan each year. The only ones not smiling at the Soladey-3's success are toothpaste manufacturers, since the Soladey-3 doesn't require toothpaste to keep teeth free from damaging dental plaque.
On the other hand, concern has been raised about toothpaste due to its fluoride content and the chronic abrasion on teeth from silica. If using toothpaste worries you, now there's an alternative!
Here's how this cool iconic toothbrush works - the Soladey-3 comes in 2 parts: a Body containing a small solar panel and a Titanium metal rod, and a replaceable Head which holds the bristles.
Light (not necessarily sunlight, either) that hits the small solar panel is converted to negative ions that travel along the rod and into the mouth, where the user's saliva exposes them to acids produced by the bacteria which cause plaque. The negative ions draw positive hydrogen ions out of the plaque, weakening its molecular structure and dissolving it away. Neat, huh?
I don't about neat! Sounds like a way to get electrocuted!