Your toothbrush (and bathroom) is a cesspool of germs.
A recent study by the American Society of Microbiology researched the presence of fecal matter on toothbrushes.
The big concern not being the presence of our own fecal matter, but those of others. Why would our own fecal matter not be an issue, you ask? Because that bacterium is already present in our bodies. Other people’s fecal matter, however, would introduce new bacterium.
It should be noted that they only studied toothbrushes from communal bathrooms. It also didn’t matter what they used to clean their toothbrush. The ones with the fecal matter were cleaned with cold water, hot water, and mouthwash designed to kill germs. All of them tested positive.
While a toothbrush cover might sound like a good idea, it’s one of the worst things you could do.
The cover will keep the head of your brush moist, which will encourage bacterial growth. You want the bristles to have the opportunity to dry out between brushings.
There are some precautions you can take:
This, of course, is no guarantee, but it will help.
Also, don’t forget to regularly change your toothbrush. It’s recommended to do it every three months.