When you think about it, having both a toothbrush and a tube of toothpaste seems like a waste of space and materials. They're both used for the same thing, so why not combine 'em?
That's just what the Twist&Brush does, turning the handle of your toothbrush into a toothpaste receptacle. Simply twist the bottom of the handle to squeeze a bit of toothpaste out onto the bristles. It's perfect for traveling, when having to get a tiny tube of toothpaste can be a pain. It's a mere concept right now, but I'd love to see this thing become a real product.