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This clip looks at the effects of different drinks on our teeth. Although there are lots of drinks to choose from, milk and water are the only ones which do not damage teeth. Some - such as coke and orange juice - can dissolve the enamel on teeth. Scientific researchers carry out tests to discover just how damaging some drinks can be to our teeth.

Students could begin by discussing how the scientists in this clip ensured that the experiment was fair and gave accurate, comparable results.

Students could then conduct their own experiments to assess the damage that can be done by a range of drinks. Instead of using teeth students could use a white shelled, hard-boiled egg. Before beginning the experiment students could discuss how the egg is similar to a tooth and should understand that like a tooth, a boiled egg has a hard but thin outer layer and is soft inside. Students could then place the boiled eggs in a range of drinks. They may want to experiment with a wider range of drinks than shown in the clip, for example tea, apple juice or milkshake. Students could make predictions about the effect these will have on the eggs. The next day students could study the eggs and note the effects. They could use a toothbrush and toothpaste to explore whether stains made on the shells could be cleaned off. Students could then draw conclusions on how the enamel dissolves in different liquids.