cut out paper toothpaste tube attached to whiteboard

In addition to fluoride, some toothpastes also contain lime as a solid component. This serves to gently remove plaque from the teeth. You can find out whether a toothpaste contains lime with a simple experiment. Lime reacts with acids: if there is lime in the toothpaste, it will start to foam when mixed with vinegar. Does your toothpaste contain lime?

You will need

  • Eggshells
  • Salt or sugar
  • Citric acid (liquid)
  • Toothpaste with and/or without lime (CaCO3)
  • 3 glasses
  • Measuring jug
  • Freezer bag
  • Rolling pin

Let’s get started!

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