Not only does it help the environment, it reduces your water bill. Dentists recommend brushing your teeth for about two minutes at least twice a day. According to an EPA WaterSense initiative, the average bathroom sink faucet flows at a rate of two gallons a minute. If you left the water running while brushing your teeth (at morning and at night), that would average 8 gallons of water per day, or 2,920 gallons per year (11,680 gallons for a family of four). If everyone in the U.S. turned off their faucets while brushing their teeth, it would amount to four times the Mississippi River’s annual flow of water (http://www.realsimple.com/home-organizing/green-living/things-save-water-10000001717653/index.html). Per person, the annual monetary savings aren’t huge, but can add up if you make a lifelong habit out of it. And it’s an easy change that will benefit the environment!