10 billion: That’s how many microbes live on your toothbrush at any given time.

“Toothbrushes can act as a lightning rod for bacteria, viruses and even what we call fungi or mold and mildew,” Dr. Gerry Curatola, founder of Rejuvenation Dentistry and author of the book Smile For Life, Rejuvenation Dentistry and the Art of Wellness, told FoxNews.com. “The types of bacteria…can range anywhere from the bacteria in the mouth that cause tooth decay and gum disease, to strep bacteria to E. coli.”

Check out these five hygiene mistakes you’re probably making when it comes to your toothbrush.