Tuesday, June 19, 2007


Control - things you need to keep the same:
  • Amount of water - by soaking the toothbrush in water for 10 seconds
  • Brand of eggs
  • The time the eggs are soaked in coffee
  • Strength of coffee
  • Toothbrush
  • Toothpaste
Test - what am I testing:
  • Change between toothpaste and water
  • You could also change between different toothpastes
Measured - what you are looking for:
  • I am looking to see if toothpaste cleans the stains off your teeth better than toothpaste

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