We devised an experiment to test the effect that different liquids have upon our teeth. As nobody was willing to use their own teeth as a subjuct for the tests, we decided that the shell of a hard boiled egg was a similar substance to the enamel on our teeth.
With the eggs representing our teeth, we put 6 eggs into different liquids and left them in sealed containers. To keep the test fair, we used similar sized eggs, the same amount of each liquid and left them in the same location for the same amount of time.
The only variable we changed was the type of liquid.
We used water, milk, cola, orange juice, lemon juice and vinegar.
After a week in the liquids we looked at the egg shells and determined how much damage had been done to each.
This is what had happened…