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That’s the number of NEW toothbrushes you should buy every year. One for each season. According to the USC School of Dentistry, after 3 months the bristles are too worn down to clean your teeth effectively and remove plaque. Plus, by that point, your toothbrush is crawling with germs. And if you’ve been sick, swap out your toothbrush if it’s in a holder where it could touch another family member’s toothbrush. Because you won’t re-infect yourself – but your germs could get transferred to someone else’s toothbrush.