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Follow these easy steps:
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- Warm the eggs to room temperature. With clean hands, wash the egg with water and dry
with the paper towel.
- Empty the entire tube contents of Crest Cavity Protection toothpaste into the measuring cup
and pat down with a teaspoon to level toothpaste and remove any air bubbles.
- Mark one side of the egg with a marker and cover this mark with clear nail polish to protect
it from the vinegar.
- After the nail polish has dried, place the egg into the measuring cup, marked side down so
the Crest covers half the egg. Make sure the egg does not touch the bottom of the cup.
- Cover the cup tightly with plastic wrap and leave it in a safe place at room temperature for
at least four full days (96 hours).
- After the treatment, with clean hands, rinse all the Crest off the egg with warm tap water
and let the egg dry overnight.
- Pour enough vinegar into the clean measuring cup to cover the egg, and then carefully place
the egg into the vinegar with the spoon. Rest the spoon on top of the egg to keep it under
the vinegar, and cover the cup with plastic wrap. Watch the bubbles form on the side of the
egg that was not treated with Crest.
- Leave the egg in the vinegar until the untreated side (the unmarked side) of the egg softens.
This will take 7 to 13 hours.
- After 7 hours in the vinegar, remove the egg and check if the side not treated with Crest has
softened by tapping it very lightly with your finger or a pen. If soft, go on to step 11 with
Crest.
- If the untreated side is still hard, put the egg back into the vinegar. Check the egg every
hour or two afterwards until the untreated shell has softened.
Note: If you are not going to be home after the egg has soaked for 7 hours, take the egg out
of the vinegar and wash it in warm water. Write down how many hours it was in the
vinegar. As soon as you return, put the egg back into the vinegar and continue checking it
every hour or so for softness. But be sure not to leave the egg out of the vinegar for more
than 12 hours.
- When the untreated side is soft, remove the egg and gently wash it with warm tap water.
The egg is very fragile now so be careful.
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The Conclusion
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By gently tapping both sides of the egg, you can now see two effects:
- Acid has made the shell not treated with Crest soft and weak.
- Crest Cavity Protection (with sodium fluoride) has protected the shell and kept it hard and
strong.
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