Ingenious! It’s a toothbrush with a specially engineered channel cut into it so that water is redirected upwards into a water fountain-like stream. With the Brush and Rinse Toothbrush, you no longer need to keep a cup by your bathroom sink, you can rinse by using the toothbrush. The brush is in pre-production right now at a little over a dollar. It will go into production should they sell a pre-determined amount by the end of the year (which they appear to be on target to do).
product page via wired