Answer to Dictation 1
White teeth are widely revered in many countries.
Go to Dictation 2
Answer to Dictation 2
Social media has helped to make ultra-white teeth a must-have.
Go to Dictation 3
Answer to Dictation 3
For decades people have used peroxide-based chemical whiteners.
Go to Dictation 4
Answer to Dictation 4
Help is now at hand for those of us who have stained or off-white teeth.
Go to Dictation 5
Answer to Dictation 5
Whitening enamel repair and microbiome balance for long-term oral health.
Go to Dictation 6
Answer to Dictation 6
It's activated by electric toothbrush vibrations which create a small electric field.
Go to Dictation 7
Answer to Dictation 7
These are compounds that break down stain-causing molecules.
Go to Dictation 8
Answer to Dictation 8
Human teeth that were artificially discoloured with tea and coffee.
Go to Dictation 9
Answer to Dictation 9
After four hours of brushing there was visible whitening.
Go to Dictation 10
Answer to Dictation 10
Researchers said the next step is to incorporate the powder into a toothpaste.
See the white teeth lesson for the whole text.
Go to the BIG dictation
