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After several unsuccessful forays into the corporate web sites of big-time toothbrush vendors, we found the answer to your question on an office bulletin of the Dental Care Network of the University of Pennsylvania. The helpful Dr. Yankell explains that for replacement indicators, color is embedded in the outer layers of the toothbrush bristles. As the bristles become thinner with use, the color wears off. Consider them built-in obsolescence indicators. That being said, most dentists recommend that you replace your toothbrush every three or four months. Oral B cites a report claiming that a new toothbrush can remove 30% more plaque than one three months old. We were also very happy to stumble across
the National Museum of Dentistry. This is our official national dentistry museum by Congressional decree, and features an exhibit dedicated to Queen Victoria's royal dental instruments called "Her Majesty's Crowns."
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