The tooth clock promotes water-efficiency during toothbrushing
The classic hourglass is modified to reflect on the responsible use of water by precisely timing 3 minutes for brushing your teeth. This is how it goes: before brushing their teeth, the user fills up the element with water and places it in the glass. During toothbrushing the water drips from the top element to the bottom of the glass for exactly 3 minutes. When empty, the top element is removed and the water collected in the glass can be used to rinse the mouth. The entire process thus requires a minimum amount of water.
