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A. It's not necessary, says Angela Myers, M.D., director of the pediatric infectious diseases fellowship program at Children's Mercy Hospitals & Clinics. Theoretically, bacteria and viruses could still remain on the bristles, but there's no evidence that people have an increased risk of being reinfected by their toothbrush. Just toss it when the bristles become frayed, about every three or four months.
Originally published in the February 2014 issue of Family Circle magazine.