girl in lab coat looks at liquid in beaker

Acids attack the tooth enamel. This is how tooth decay develops. Fluoride in toothpastes is supposed to protect against this. But how? We are investigating this question using a substitute: eggshells! Like our tooth enamel, eggshells contain acid-sensitive calcium compounds. Does toothpaste with fluoride protect against the harmful effects of acids?

You will need

  • 4 eggshell halves (preferably 2 dark and 2 light)
  • Marker pen
  • Fluoride gel or toothpaste for adults
  • Table vinegar
  • Paper towels
  • 4 jam jars
  • 4 teaspoons
  • Stopwatch
  • Measuring jug

Let’s get started!

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