研究人员开发了一种新型陶瓷粉末牙齿美白技术，通过电动牙刷振动激活电场分解污渍，比传统化学美白剂更安全且能修复牙釉质。
White teeth are widely sought after. Movies, ads, and social media have made perfectly white teeth a must-have. People have long-used chemical whiteners to get perfectly white teeth. However, these can damage the teeth and gums.
Researchers have tested a teeth-whitening ceramic powder to rid teeth of stains. Researcher Min Xing said it is a safe teeth-whitening product that also repairs enamel. Min added that it was good for long-term oral health.
The researchers said the powder works when the vibrations of an electric toothbrush activate small electric fields over the teeth. These break down stains. The researchers said their laboratory tests were very promising. They tested human teeth that were stained with tea and coffee. After 12 hours of cleaning, the teeth were 50 per cent whiter than those that were brushed normally.
The next step is to add the powder to toothpaste.