close up of test tubes with eggshells in liquid

What causes cavities? Sugar? Not directly. There are bacteria in the mouth that convert sugar into acid. And acids are harmful to teeth. We want to test how, but because we don’t want to destroy our teeth in the test, we need a substitute. In this experiment we are using eggshells. Like teeth, they contain calcium and are sensitive to acids. So how do acids react with eggshells – our substitute for teeth?

You will need

  • Approximately 100 ml citric acid
  • 1-2 empty eggshells
  • Rolling pin
  • Freezer bag
  • Accurate scale
  • Measuring cup
  • Funnel with coffee filter
  • Spoon
  • 2 empty jam jars

Let’s get started!

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