A research team at Peking University in Beijing has developed a battery-free toothbrush that generates electricity as its bristles move, using the charge to damage bacteria in saliva. The study was published in Science Advances on 4 November 2026.
The bristles are made from polyvinylidene fluoride. Researchers stretched and heated the polymer to give it piezoelectric properties, which allow it to produce an electrical charge when deformed. As the bristles bend during brushing, the charge prompts the formation of highly reactive oxygen compounds in nearby saliva. The researchers say these compounds damage bacterial cell membranes; when the bristles straighten, the material absorbs the charge again.
Conventional bristled toothbrushes mainly rely on movement to disrupt plaque, a film in which bacterial communities grow. Frank Scannapieco, a periodontist and microbiologist at the University of Buffalo, described generating electricity through brushing as a new variation on an established idea. He said it might remove plaque more efficiently, while emphasizing that further testing is needed to establish its effectiveness and safety.
The researchers found no damage to tooth surfaces and no toxicity to human cells in their tests. They did not assess the brush’s long-term safety or cost.
Sources: Nature.