Brushing your teeth without wasting water down the drain.
Oral health care is important and that does include brushing your teeth at least twice a day for two to three minutes. However try and beware of the water that is being used.
With kids it is very easy for them to run the water the whole time while brushing there teeth. Teach them how only very little water is needed and to turn off the tap while the are brushing. Have a small cup out filled with water for them to rinse with and turn on the tap just to quickly wash the sink clean when done.