Do you know what's lurking on your toothbrush?
Your toothbrush is loaded with germs, say researchers at England's University of Manchester. They've found that one uncovered toothbrush can harbor more than 100 million bacteria, including E. coli bacteria, which can cause diarrhea, and staphylococci ("staph") bacteria that cause skin infections.
But don't panic. Your mouth wasn't exactly sterile to begin with.