There's a solid chance your toothbrush is riddled with fecal bacteria, according to a new study.
Researchers at an American Society for Microbiology meeting on Tuesday presented a study showing that 60 percent of toothbrushes analyzed in communal bathrooms at Quinnipiac University in Connecticut tested positive for fecal coliform bacteria.
To make matters worse, the research shows that if you're sharing a bathroom, there's an 80 percent chance that those fecal bacteria came from someone else's bum.
Tiny fecal coliforms are a part of everyday life -- they can be found in natural waterways and even on your skin. But don't poo poo this study just yet. Researchers said your own coliforms are fine, but your gut isn't used to the bacteria in, say, your roommate's gut.
"The main concern is not with the presence of your own fecal matter on your toothbrush, but rather when a toothbrush is contaminated with fecal matter from someone else, which contains bacteria, viruses or parasites that are not part of your normal flora," said Lauren Aber, a graduate student at the university.
So what can you do to stop the spread of poo? The study found that mouthwash, hot water and cold water were all ineffective at thwarting the fecal menace. Toothbrush covers, it says, are even worse for your brush because they create a moist, protected environment for bacteria to grow.