Microscopes Show What A Toothbrush Looks Like After Three Months Of Use.

Medical Daily (11/12, Olson) reports that Google engineer Ben Krasnow used “microscopes to reveal what all that brushing does day-in and day-out,” to a toothbrush. Krasnow found that “after just a few months the toothbrush is smooth, worn down by the abrasive effects of the toothpaste, rendering it nearly ineffective for proper dental hygiene.” Medical Daily says that “under a microscope, a three-month old brush looks pretty useless.” According to the ADA, “consumers should replace their toothbrushes every three- to- four months or sooner once the bristles become frayed with use.” The ADA provides more information and tips for keeping toothbrushes clean at mouthhealthy.org.