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Research•Phosphoric acid is used in cleaning products to break down grease and rust.•Shells from boiled eggs have calcium amounts similar to tooth enamel.Margles, Samantha. Mythbusters Science Fair Book. New York: Scholastic, 2011. Print.•Soda can erode tooth enamel.•Tooth enamel is the protective layer of your tooth and soda destroys it. Enamel is the hardest substance in your body.http://www.brainpop.com/health/bodysystems/teeth/preview.weml• Sugar and acid (citric and phosphoric ) cause tooth enamel damage.http://www.fitday.com/fitness-articles/nutrition/healthy-eating/4-health-side-effects-of-diet-soda.html
Scientific ClaimWe think if a boiled egg sits in a cup of Sprite, Coca-Cola, and Diet Coke. Then we believe that the egg will erode most in the Diet Coke. That is because Diet Coke has both phosphoric acid and citric acid. While Sprite only has citric acid. And Coca-Cola only has phosphoric acid. Therefore, Diet Coke will erode the egg more.
VariablesIndependentType of soda
DependentEgg erosion
Controlled• The amount of soda in each cup
•Time egg sits in soda•Same amount of eggs in each cup of soda
• Same beakers used to pour soda• same type of cups
Materials• one 2 liter bottle of Sprite, Diet Coke and Coca-Cola•Fifteen 9 ½ cm by 4 ½ cm plastic cups• 15 hard boiled eggs •data sheet• 1 dipper (from Easter egg kit) or a plastic spoon• 3 rulers• 3 pieces of yarn (enough to wrap around each egg)• two 150 ml beakers•One permanent marker
Procedure1. Label the three cups with each type of soda and trial in
permanent marker.2. Pour 150 milliliters of the sprite into 5 cup, diet coke in to
another 5 and then the coca-cola into the last 5 cups.3. Wrap the piece of ribbon around each egg tightly4. Pinch where the two ends of yarn meet5. Unwrap the yarn until straight ( still pinch where the end meet)6. Measure the length of the string ( from end to where you are
pinching using centimeters)7. Record on data sheet and repeat steps 3-6 on the rest of the
eggs 8. Place one hard boiled egg into each cup of soda9. Record the time you put the eggs in, and wait 24 hours.10. Take the dipper or plastic spoon and remove each egg from the
cup11. wrap the yarn around the eggs and repeat steps 4-612. Dump the soda out of the cup into a sink13. Repeat steps 1-12 four more times14. Take the egg circumference from before the eggs were put in
soda and subtract it from the egg circumference after it was put in the soda for each type of soda
15. Add up the scores of the circumferences for each different soda and divide that by 5
16. Whichever soda has the greatest mean is the one that eroded the egg the most
EvidenceEffect of Soda on Erosion of Teeth (Egg
Shells)
Type of Soda
Trial 1 Trial 2 Trial 3 Trial 4 Trial 5Average
Decrease in Egg’s
Circumference (cm)
Egg Circumference (cm)Befor
eAfter Befor
eAfter Befor
eAfter Befor
eAfter Befor
eAfter
Sprite 14.1
13.5
12.2
12.2
12.9
11.9
14.6
13.4
13.9
12.9 -0.86
-1.1 -0.0 -1 -1.2 -1
Diet Coke
14.3
13.2
14.3
13.5
13.2
12.5
12.2
12.2
13.3
12.8 -0.62
-1.1 -0.8 -0.7 -0.0 -1
Coca- Cola
14.2
13.7
12.5
12.2
14.6
12.2
14.5
12.8
13.2
12.5 -1.1
-0.5 -0.5 -2.3 -1.7 -0.7
Data Graph
Trial 1 Trial 2 Trial 3 Trial 4 Trial 50
0.5
1
1.5
2
2.5
Effect of Soda Erosion on Teeth
Sprite
Diet Coke
Coca-Cola
Ero
sio
n (
cen
tim
ete
rs)
Written AnalysisWe tested sodas effect on tooth enamel
and used eggs instead of teeth. We put eggs in cups of Sprite, Diet-Coke and Coca-Cola. We waited 24 hours then measured the amount of erosion. We found out that the average amount of erosion of eggs in Sprite was 0.86cm, Diet-Coke was the least at 0.62cm, and Coca-Cola was the most eroded at 1.1cm. Coca-Cola did the most damage. When we took the eggs out Sprite had no color change. Diet-Coke turned the egg to the darkest brown color and the eggs in Coca-Cola changed to the dark brown but not as dark as diet. The eggs in Coca-Cola felt rough but the other two stayed smooth. Yes there was a relationship because the different soda eroded differently on the eggs.
Scientific ReasoningOur scientific claim was not supported
because we thought Diet-Coke did the most damage but Coca-Cola did the most damage. One thing I can infer from my experiment is sugar causes more damage then acid. Or maybe it’s a combination of sugar and phosphoric acid, since Coca-Cola has phosphoric acid and 39 grams of sugar. So Coca-Cola did the most damage. In this experiment, I found out that different types of soda you drink effects your tooth enamel differently. The data showed that Coca-Cola did the most damage. It had phosphoric acid and 39 grams of sugar. Compared to Sprite which has citric acid and 38 grams of sugar. And Diet Coke has phosphoric acid and citric acid and 0 grams of sugar, and did the least damage. I would also like to find out is how much acid is in each soda? Are there other soda’s that damage your teeth more than Coca-Cola?