Brush and Rinse

This toothbrush concept from Scott Amron can redirect water from a faucet to the user's lips for easy rinsing. This toothbrush has a slight indentation behind the head that redirects water in a stream to the user's mouth, removing the need for rinsing cups or using one's hands to get water for rinsing.

There are two incarnations of the design, though I prefer the one above rather than the second one, if only because of the greater risk of contamination with the tube-type brush.  The best thing about this design is that it adds no cost for manufacturing.

The video of the toothbrush in action can be seen below:

Source: Amron Experimental