When new toothpastes are developed, the existing recipes are changed. These need to be tested before manufacturing and production. To keep teeth healthy, they should be brushed twice a day. New toothpastes are always being developed. New recipes may reduce plaque, taste different or feel different in terms of the amount of foam the toothpaste makes. Each property which is changed requires a different kind of test. Sometimes computers help to measure the results, but humans are needed to trial the taste. Machines can be used to scientifically measure the foaming properties of the formula and to carry out fair tests. Markets in different countries have different preferences. Chinese markets like their toothpaste to produce a lot of bubbles, while the German market prefers less foam.
- This clip is from:
- First broadcast:
- 8 October 2007
Pupils could follow up on the clip by finding out more about their own teeth. They could use a range of information sources to identify the different types of teeth (molars, canines and incisors). They could bite into an apple and then examine the shapes left in the apple by their teeth - can they identify which types of teeth they used to take that bite? Pupils could use a mirror to discover which areas of their teeth are hardest to clean. Ask children to eat a biscuit and then to check in the mirror where on their teeth any biscuit crumbs still remain. Ask the children to brush their teeth. Does this get rid of all the biscuit crumbs? Children could go to research and design posters about keeping your teeth healthy.