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| Objectives: |
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Students
will learn that fluoride helps protect teeth
against decay. |
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Students
will make observations of chemical reactions. |
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| Materials: |
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Fluoride
solution (available from your dentist, a dental
supply company, or some pharmacies) |
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Vinegar |
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2 hard
boiled eggs |
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3 clear
containers |
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Science
journals |
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Pencils |
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| Instructions: |
| 1. |
Have
the students take out their science journals
to prepare for the experiment. |
| 2. |
Place
one egg into a container and pour in enough
fluoride solution to cover it. |
| 3. |
Let
the egg soak for five minutes. Remove the
egg. |
| 4. |
Pour
four inches of vinegar into the remaining
two containers. |
| 5. |
Place
the treated egg into one container of vinegar,
and the untreated egg into the other. |
| 6. |
Ask
the students to carefully observe the reaction
in either container. The bubbling in the non-treated
egg is a chemical reaction of the acid in
the vinegar with the calcium of the eggshell.
The acid is dissolving the untreated eggshell.
The fluoride treatment protects the one egg's
shell from the acid, while the acid attacks
the untreated egg's shell. Our teeth need
to be protected from the acids in our mouths
with fluoride, too. In order to keep our teeth
healthy, we need to keep them clean by brushing
and flossing, use fluoridated toothpaste,
eat healthy foods, and visit the dentist twice
a year. |
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