Even with regular brushing, teeth can become stained due to genetics or foods and drinks such as coffee and tomatoes. While chemical whiteners can help, they often damage enamel. Now, researchers reporting in ACS Nano have developed a prototype teeth-whitening powder activated by electric toothbrush vibrations, which brightens teeth while protecting them.
“This work offers a safe, at-home teeth whitening strategy integrating whitening, enamel repair, and microbiome balance for long-term oral health,” said Min Xing, first author of the study.
Traditional peroxide-based whitening products, including strips, gels, and rinses, rely on reactive oxygen species (ROS) to break down stains. However, these treatments can weaken enamel, leaving teeth more vulnerable to future staining and other problems. To address this, Xing and colleagues—including Wenhao Qian, Xuanyong Liu, and Jiajun Qiu—created a compound that generates ROS through toothbrush vibrations while simultaneously strengthening teeth.
The team combined strontium and calcium ions with barium titanate to form a ceramic powder called BSCT. Vibrations from an electric toothbrush induce a small electric field in the powder, triggering ROS production.
Lab tests on human teeth stained with tea and coffee showed visible whitening after four hours of brushing with BSCT. After 12 hours, treated teeth were nearly 50% whiter than the control group brushed with saline. The powder also repaired damaged enamel and dentin, as the mineral ions deposited onto the tooth surface.
Further tests on rats fed high-sugar diets showed that daily one-minute brushing with BSCT over four weeks restored oral microbiome balance. The treatment reduced inflammation and eliminated harmful bacteria, including Porphyromonas gingivalis and Staphylococcus aureus.
Although BSCT has not yet been incorporated into toothpaste, researchers say their findings represent a promising step toward a safe, effective at-home teeth-whitening solution that also supports oral health.