Year 4 Get Their Teeth Stuck into Science 13th February 2026 Science Over the last few weeks, Year 4 have been learning all about teeth and how to keep them healthy. We constructed model teeth using recyclable materials and last week, we set up an investigation to see the effects of different drinks on our teeth. We used eggs to represent teeth as the eggshell is similar to enamel. We tested Coca Cola, orange juice, milk and water by placing the eggs in a cup of each drink. Most of us predicted that Coca Cola would be the worst drink for our teeth, but after a week, we found that it was in fact orange juice that was the worst. We couldn’t believe what the egg looked like! The eggshell had begun to dissolve and was very soft and cracked. We found that milk and water caused no damage to teeth at all. Can you guess which egg was in each liquid?