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The Teeth: Never

After using a toothbrush, rinse it carefully, wipe it dry on a clean towel and hang it up where it will be exposed to sunlight and a draught of air. Never keep a toothbrush in a closed box or hang it up in a closet. Never lay down a wet toothbrush to dry, especially on the back, as this allows the moisture to run along the bristles into the back of the brush, softens the glue with which they are fastened in, and causes them to decay and fall out. It is hardly necessary to say that no two persons should ever use the same toothbrush.