Toothbrushing Mistake No. 9: Not Letting the Toothbrush Dry

"If you have a toothbrush that's perpetually moist, it will cultivate more bacteria," says Sesemann.

"If the bristles stay soggy, you can misshape them as you use the brush," Price says. "Or it might be a breeding ground for bacteria."

It's a good idea to shake out the moisture, then recap it with a cap that allows air in, he says.


cited from http://www.webmd.com/oral-health/healthy-teeth-10/brushing-teeth-mistakes?page=2