Overview
- Peking University researchers published the device in Science Advances on Wednesday, November 4, 2026, describing a manual toothbrush with piezoelectric polyvinylidene fluoride (PVDF) bristles that generate an electrical charge as they bend.
- The bending PVDF filaments produce reactive oxygen species (ROS) in saliva, and the team presents lab evidence that those ROS damage bacterial membranes and disrupt biofilms.
- In laboratory tests the electrified bristles reduced Streptococcus mutans by more than half and cut Porphyromonas gingivalis by up to 78%, and removed over 99% of biofilm grown on cow enamel compared with much lower removal by nylon bristles.
- A randomized three‑month clinical trial of 115 adults found that users of the PVDF brush had less plaque, reduced gum inflammation and bleeding, and shifts in the plaque microbiome toward fewer disease‑linked bacteria than users of conventional nylon brushes.
- Independent scientists say the results are encouraging but preliminary because longer, larger trials are needed to confirm long‑term tissue safety, whether benefits lower cavities or periodontitis, and how the device would perform at scale and cost.