New powder whitens, repairs and protects teeth
Slowest
Slower
Medium
Faster
Fastest
This useful resource has hundreds of ideas, activity templates, reproducible activities for …
and a whole lot more.
20 Questions | Spelling | Dictation
READING:
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.
Try higher levels. The listening is a little longer, with more vocabulary.
This page has all the levels, listening and reading for this lesson.
← Back to the white teeth lesson.