A student provides the following directions for brushing teeth: • Turn on the water. • Fill the glass with water and leave the water running. • Put toothpaste on the toothbrush. • Brush for two minutes. • Rinse mouth with the water from the glass. • Rinse the toothbrush with the running water. • Turn off the water. Which change in these directions would conserve the most water?
Brush for three minutes. Turn the water off before brushing. Rinse mouth with the running water. Use less toothpaste on the toothbrush.
A B C D