Robots sure are helping us more and more these days they can even advise how long you should clean your teeth for just flip over the sand timer in this robot39s hand and start scrubbing away at your gnashers when the final grain of sand tumbles through the hourglass it39s time to rinse and spit then place your toothbrush back in the robot39s backpack for next time it39s the perfect way to teach children how long they need to clean their teeth for