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Battery-free toothbrush uses bristle motion to target bacteria

Researchers in Beijing, China, say a brush with piezoelectric bristles generates electricity as it moves. A three-month trial found lower plaque scores, but longer-term testing is still needed.

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Photo: Medical Xpress

  • Researchers at Peking University developed a battery-free toothbrush whose bristles generate electrical charges as they bend, producing substances that damage bacteria. NatureMedical Xpress

  • In a three-month trial involving 115 adults, plaque scores fell by about 40% among users of the new brushes, compared with roughly 15% for people using standard brushes. Medical Xpress

  • The researchers reported reduced gum inflammation and bleeding, but say longer-term follow-up is needed; a separate expert said more testing must establish safety and effectiveness. NatureMedical Xpress