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Teeth through time: 20th-century mouthwash
Materials Required

  • 1 pint of boiled water, cooled
  • 1 teaspoon of salt
  • 1 teaspoon of fennel seeds
  • Pinch of sugar
  • 3 drops of peppermint oil (peppermint flavouring)
  • Pestle and mortar
  • Spoon
  • Mixing jug