We look at the effects of different drinks on our teeth. There are a lot of drinks to choose from, but the only drinks which do not damage teeth are milk and water. Some drinks such as cola and orange juice can dissolve the enamel on teeth. Scientific researchers recognise that teeth would not be soaked in drinks for hours at a time and saliva has an impact on the results. Tests are carried out to find just how damaging some drinks can be to the enamel on our teeth.

First broadcast:
8 October 2007

Could be used as a vehicle to test the experiment-design skills of pupils. Watch the first part of the clip where the professor explains why using teeth isn't the fairest way of testing the effect of different drinks on tooth decay. Pause the clip before the professor gives his reasons and ask them to suggest why the test isn't fair. Could the children design a fair test themselves? What equipment would they use? (eg coins and chalk instead of teeth). What liquids would they test? How would they measure their results? Watch the rest of the clip to explore how the scientists refined their fair test. Allow the pupils to evaluate their experiment, make their predictions, carry out their experiment and draw conclusions. Did their results match the findings of the scientists? Ask the children to design a poster to reinforce the message to other children and their parents.