We've previously looked at the importance of brushing teeth to remove stains that certain foods may leave on the teeth. This week and next we'll examine the importance of brushing teeth as a preventative measure.
The fluorine in toothpaste binds with calcium in your teeth to form calcium fluoride, which strengthens your teeth.
For this experiment, you'll want to make sure you use a fluoride toothpaste. You'll see it listed in the active ingredients as sodium fluoride.
Coat one egg with toothpaste - all over. Allow the egg to sit overnight with the toothpaste on it.
Observe the eggs over the course of the next 24 hours.
You will notice that the cup with the untreated egg develops a foamy white substance on the top of the vinegar in a fairly short amount of time. That foam is made of dissolved calcium - the shell is dissolving. The treated egg does not produce nearly so much.