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Copy of Science Experiment
Transcript of Copy of Science Experiment
• Four classes
• Two eggs
• Soft drink
By Jemma Hamilton
The effect different drinks have on tooth decay
Why did I choose this
Parents and adults are always telling children that certain things are bad for your teeth such as soft drinks and juices and that drinks like milk are good for your teeth. Teeth and eggshells have the same chemical composition, calcium carbonate. The calcium carbonate is very thin and has many pours in the surface and can be damaged or destroyed by weak acid. I tested what drinks cause your teeth to decay by placing eggshells in four different types of drink.
To find out whether water, soft drink, juice or milk causes the most tooth decay.
That soft drink causes the most tooth decay as it is filled with sugar and preservatives, closely followed by juice for the same reasons.
Consuming the drinks whilst carrying out the experiment. Touching the eggshells during the experiment as they could contain bacteria.
Wear gloves if you plan to touch the eggshells and do not digest the drinks.
Controls: types of glasses used, the amount of drink placed in each glass, environment where the glasses are placed, type of eggshell used and the amount of eggshell placed in each glass
Independent variable: the type of drink placed in each glass
Dependent variable: the eggshells- how the shell decays
Control: did not use a control
1. Place half an eggshell in each of the four glasses; be sure to rinse the eggshells before hand.
2. Fill one of the glasses with water, one with milk, one with juice and one with soft drink. Take a picture of the setup of the experiment.
3. Leave glasses in an undisturbed area for one week and daily record any changes in colour, shape, smell or texture. Also take a picture of the experiment daily.
4. Tabulate and graph the results after recording final observations.
The experiment and investigation was quite successful as I discovered which drink decays teeth the most and how it does this. The eggshells decayed differently as to how I would of expected and each decayed at a particularly strong rate in a specific area. The soft drink eggshell change colour, the juice eggshell changed a lot in texture, the milk eggshell smelt terrible and the water eggshell changed a little in shape. The experiment cannot be completely reliable as we are using eggshells not real teeth, and they as not in the same environment as they would be in the mouth. Drinks low in pH levels cause dental erosion and they lower the pH level of the mouth but saliva acts as a buffer and regulates the pH when acidic drinks are ingested. Most people also regularly brush their teeth and this stops a lot of decay.
Some improvements that could be made to the experiment include having an eggshell sitting in an empty class as a control so I could compare the other eggshells to it. I also could have changed milk daily as it got extremely disgusting and I think this had a strong effect on how the milk eggshell decayed. Eggshells and teeth also share similar colour spectrums from rusty brown to bright white and to make the colour aspect of the experiment more realistic I could have used white eggshells. I think the type of each drink used also has an effect as some soft drink has more sugar or acidic ingredients and in this experiment I used concentrated juice which has high levels of sugar and preservatives.
Although most of the eggshells decayed in some way, I would have to say that the juice eggshell decayed the most as it weakened a lot from the inside and became very hard on the outside, forming rock bubbles. This would have a very bad effect on your teeth and if you regularly drank this juice but didn’t brush, your teeth would decay a lot. The soft drink did not decay as much as I thought it would but it did turn a deep pink colour and the outside of the shell became soft and smooth and the original colour of the shell was rubbing off. Next was the milk eggshell which I think would of decayed differently with fresh milk each may but the shell still seemed to soften in the early days of the experiment. The water eggshell should not have changed too much and it only weakened a little on the outside. My hypothesis was incorrect and I would propose a new one with juice and soft drink switched.
• Book: Tooth Decay and Cavities by Alvin Silverstein