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Which Soda is Most Corrosive on Your Teeth?

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Jacob Sheldon

on 19 August 2013

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Transcript of Which Soda is Most Corrosive on Your Teeth?

Which Soda is Most Corrosive on Your Teeth?
By Jacob Sheldon

Which Soda is Most Corrosive on Your Teeth?

Index:
Intro
Aim
Hypothesis
Equipment List
Method
Results and Observations
Diary
Analysis
Conclusion
Bibliography

Introduction
After much research, scientists have explained that soft drinks with higher carbonic acid levels are a lot worse for your teeth than others, causing your teeth rot and start to corrode a lot faster. "Many popular diet and sugared sodas are nearly as corrosive to dental enamel as battery acid." It was also proven in 2006 that cola beverages destroy 10 times more teeth material than fruit juices in just the first three minutes of drinking. The table to the side was taken from: "http://quittingsoda.com/post/the-acidity-ph-of-soda-pop" and shows the level of pH

(A measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from 0 to 14. http://www.thefreedictionary.com/PH )

in different sodas, and if you have a look at the table, the sodas at the top of the list are the most acidic which so happens to be the darker sodas meaning that they would most likely do more damage to your teeth than not so acidic lighter sodas.
Aim:

The Aim for this experiment is to find out by doing a series of tests or experiments, which soda is the worst/most corrosive, therefore finding out which soft drink is most harmful and rots your teeth the fastest.




Hypothesis:
After some research, general thought and knowledge, I have come to a hypothesis that the darker coloured soft drinks will be the most corrosive on your teeth than the lighter coloured soft drinks and the water. This is because of the higher acidity
levels in the soft drinks.

Equipment List:

Quantity and Item
1x Small bottle/can of Coke
1x Small bottle/can of Pepsi
1x Small bottle/can of Orange
1x Small bottle/can of Lemon
1x Small bottle/can of Lemonade
1x Small bottle/can of Creaming Soda
1x cup Distilled water
7x Clear plastic cup
14x Tarnished pennies
1x Logbook
1x Measuring cup
14x Sticky notes
1x Pen

Method:

Fill a plastic cup with 1/2 cup (measured) of the required soft drink making sure the cup is labelled with the liquid that is contained within it.
Repeat step one with the remainder of the cups, filling each one with a different soda
Finally fill the last cup with 1/2 (measured) distilled water and that shall be the control
Drop each of the tarnished pennies in a separate cup. The penny that is soaking in the cup of distilled water will be your control.
Observe the tarnished pennies every 30-60 minutes, recording the data in a logbook
Repeat the whole test and do it for a second time to improve the accuracy of the test
Once complete observe both sets of results and determine the answer to the question of 'Which Soda is most corrosive on your teeth?'
Create a report and include all of your results including- Method, Hypothesis, Pictures, etc.

Results and Observations:

For the experiment part of this project I started well with the set up and beginning process running smoothly but as told in my diary I had a little hiccup, not knowing that the progress of the coins would be so quick so I had to do the experiment for a second time, which definitely improved my results.

(In the table of photos, the order of the coins and cups left to right, are always- Coke, Pepsi, Creaming Soda, Lemonade, Lemon, Orange.)

Diary:
23 July 2013, I have filled 6 cups full of soft drink and one full of water,
I have dropped one tarnished coin in each cup,
I have taken photos,
Now to wait and see what happens.

24 July 2013, I came back to have a look at the progress of the coins.
I have found I left it for too long and there is not very much to compare, only
the final result.
It looks like the darker soft drinks have made the coins cleaner except for the
coke, which seems to be a little dirtier/darker than the rest.
I am going to leave it for a while longer to see what happens.

26 July 2013, I came back to the coins and found that my original hypothesis was
looking kind of dull, the lighter soft drinks clean the coins quicker than the darker ones.
I then Started the process for a second time, with new liquids and coins.
I have now got to come back soon and see how they are going.
I came back half an our later and the coins have already been effected by the
soda
The result is still the same, lighter drinks have made more of a difference
I left them for another hour
Found that they are exactly the same
Over all, both tests had the same conclusion of the coins being cleaner in the
lighter sodas

Analysis:

The following table shows in order from the most corrosive to the least.

Conclusion:
For this experiment I researched many websites to see what other fellow scientists think and have proven about the topic/question "Which Soda is most corrosive and harmful on your teeth". The results for every website was that the darker sodas would be more corrosive so I asked the question why?. The answer was because of the pH level of each soda with darker sodas having a higher acidic pH level. Because of this research, my hypothesis ended up being that the darker sodas would be more corrosive on your teeth than the lighter sodas. As I went on with the experiment, the result ended up being completely opposite to what the hypothesis was, meaning that the lighter sodas were more corrosive than the darker ones. This stumped me and led me to keep asking the question why? After much thought, I could only come up with the conclusion that either- since others have done the test, the companies have changed their recipes or ingredients for the soda or the darker sodas that were used in the tests, had less fizz in them when used due to shaking or being dropped before the tests were complete.
Over all I think this experiment was very interesting and left me wanting to go further, do the test again and find the final result on if the darker or lighter sodas are more corrosive, also seeing if it was just these two tests done that were dodgy or it is true that companies have changed their ingredients.

If this test was to be done again, things that could be improved are-
• More test done in similar environments
• The liquids used should come from totally new bottles for each test
• Get the coins to be almost identical before the start of the test
• Use a larger range of sodas to improve results
• Check progress more often

Bibliography:
http://www.sciencefairadventure.com/ProjectDetail.aspx?ProjectID=106
http://www.livescience.com/7198-acids-popular-sodas-erode-tooth-enamel.html
http://www.ask.com/question/which-soda-is-the-most-corrosive
http://news.softpedia.com/news/Cola-Destroys-Your-Teeth-50000.shtml
http://quittingsoda.com/post/the-acidity-ph-of-soda-pop
http://www.thefreedictionary.com/Ph
http://explorable.com/corrosiveness-of-soda-experiment
http://www.dentistry.net/dental-nutrition/soda-on-teeth/
https://www.google.com.au/imghp?hl=en&tab=wi
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