to prevent colds, flu, and other sicknesses, Reader's Digest recommends that once or twice a week you run your toothbrush through the microwave on high for 10 seconds immediately before brushing. If someone in your home is sick, you may want to sterilize it in the microwave each time you brush. If you're the one who's sick, after the illness passes, ditch your old toothbrush and replace it with a new one.

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