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Toothbrush zaps bacteria with electricity from moving bristles
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Toothbrush zaps bacteria with electricity from moving bristles

Researchers at Peking University have developed a battery-free toothbrush that generates electricity as its bristles move. Made from a specially treated polymer, the bristles produce a charge when they bend during brushing. That charge creates highly reactive oxygen compounds in saliva, which can damage bacterial cell membranes. Early tests found no damage to tooth surfaces or toxicity to human cells, though the brush’s effectiveness and long-term safety still need study.
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