The toothbrush of the future may surprise you.
Some background, for anyone who doesn't subscribe to Dentistry Illustrated Weekly: the plasma brush isn't a toothbrush, but actually a tool dentists are hoping to use for two primary situations. The first is breaking up plaque; the plasma torch, though it's no hotter than room temperature, is excellent at breaking the bonds that adhere plaque to a tooth. The second is as a sort of primer for filling cavities.
There are certain kinds of cavities, according to Hao Li, associate professor of mechanical and aerospace engineering in the Missouri University University of Missouri College of Engineering, that need to be refilled every five or seven years using current technology--and they can only be refilled a few times before having to be pulled. The plasma brush can prime a cavity for filling in sort of the same way pavers create those divots in roads before filling them in with new asphalt: it provides more surface area for the filling to stick to, and the research team claims plasma-assisted fillings could be 60% stronger than traditional fillings.