Bacteria can grow on an un-rinsed toothbrush. Then, the next time you brush your teeth, you may actually put old bacteria back in your mouth, says Laurence Rifkin, DDS, a dentist in Beverly Hills, Calif.
Rinsing the toothbrush after you brush will help remove any leftover toothpaste, too.
cited from http://www.webmd.com/oral-health/healthy-teeth-10/brushing-teeth-mistakes?page=2
cited from http://www.webmd.com/oral-health/healthy-teeth-10/brushing-teeth-mistakes?page=2
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