This experiment takes five to six days. We recommend you start on a Thursday or Friday afternoon. That way, you can perform all the steps
right after school or supper. When you try the experiment, use several eggs in case one gets broken
by accident.
What you will need:
4.6 oz tube of Crest Cavity Protection toothpaste (active ingredient: sodium fluoride)
glass measuring cup
fresh eggs without cracks
table vinegar
teaspoon
plastic wrap
marker
clear nail polish
paper towels
Why use an egg?
Eggshells, like teeth, contain minerals and must stay strong to do their job. Both eggshells and teeth
can be weakened by acid, which is why good dental hygiene is so important.
Why use vinegar?
Vinegar is an acid similar to the acids made by plaque bacteria in our mouths every day. These
acids can cause tooth decay and cavities.
