Rule of Thumb

BRUSHING YOUR TEETH

Get a new toothbrush as soon as your old one gets frayed. If you’re not going through four toothbrushes a ...

Get a new toothbrush as soon as your old one gets frayed. If you’re not going through four toothbrushes a year, you’re not brushing your teeth enough. — Gerald Gutlipp, mathematician, Chicago, Illinois

01/23/17

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