USA Today notes that toothbrushes can harbor bacteria, including fecal coliform bacteria. Although it is unlikely these bacteria will cause adverse health effects, USA Today states that “how you store your toothbrush is often what really matters.” The article notes that the American Dental Association recommends people rinse their toothbrushes with tap water after brushing and allow toothbrushes to air dry, since covering toothbrushes can create an environment more conducive to bacteria growth. In addition, the article recommends people replace their toothbrushes every three to four months and never share a toothbrush.
MouthHealthy.org and the Oral Health Topics on ADA.org provide additional information on toothbrush care for patients and dental professionals. In addition, the ADA provides a list of toothbrushes with the ADA Seal of Acceptance.