Looks like there was a study done recently on toothbrushes and how much bacteria they hold. The results showed that hollow-head brushes can contain up to 3,000 times the bacteria than solid-head, electric toothbrushes!
The study was held over three weeks and was conducted by The University of Texas Health Science Center at Houston (UTHealth) School of Dentistry.
Read this article for more information on the study.
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