Gap Fill - White Teeth - Level 6

HOW TO PLAY:

  • Choose the correct word from the drop-down menus below.
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.

   artificially      brushing      molecules      new      saline      species      step      trials      vibrations      visible   

Paragraph 2

The researchers wrote about how their powder works. It is activated by electric toothbrush , which create a small electric field over the teeth. This causes a reaction known as "reactive oxygen ". These are compounds that break down stain-causing . The researchers said their laboratory were very promising. They tested human teeth that were discoloured with tea and coffee. After four hours of , there was whitening. After 12 hours of cleaning, the teeth were 50 per cent whiter than those brushed with . The researchers said the next is to incorporate the powder into a toothpaste formula.

Try the sentence jumble.

Back to the white teeth lesson.

Share this lesson

More Free Sites by Sean Banville

Online Activities