How often you should wash your bath towel, according to a microbiologist — and what happens when you don't In Philip Tierno's mind, a moist towel is practically a living organism. "A damp towel is growing," Tierno , a microbiologist at the New York University School of Medicine, told Business Insider last year. Towels serve as ideal breeding grounds for germs because they contain many of the requirements for microbial life : water, warm temperatures, and plenty of oxygen. Where there is moisture, there are microbes. Because of this, Tierno says you should only use a towel three times before tossing it in the wash — and that's assuming it gets completely dry after each use. A good indicator that a towel has remained damp for too long is the smell. "If there is odor coming from the towel, wherever there is odor, there are microbes growing, so it should be washed," Tierno said. By drying yourself with a towel coated in bacteria, you're...
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