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Which stains egg shells (teeth) the most: coffee, tea, or co

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by

Jenna Pobrislo

on 14 May 2014

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Transcript of Which stains egg shells (teeth) the most: coffee, tea, or co

Our teeth are naturally an off-white color. They can, however, be stained by various factors. There are foods and beverages which can stain and discolor our teeth. The type of stain that is caused by food and beverages is called extrinsic staining. Extrinsic stains can usually be removed by proper dental care. A beverages acidity, chromogens, and tannins determines its staining potential. Acidity promotes staining by eroding the enamal on teeth and making it easier for chromogens to stick to the teeth.
Background
Which stains egg shells (teeth) the most: coffee, tea, or cola?
Some beverages stain our teeth. Coffee, tea and cola are some of the beverages which can stain our teeth. I wondered which beverage caused the most staining. As i had no teeth to use for this experiment, so i wondered which beverage would cause the most staining on egg shells.
problem
Cola is more staining to egg shells than coffee or tea
Hypothsis
Amount of beverage
Temperature of beverage
Location of beverage ( Sunlight, humidity)
Containers the beverages were placed in
Type and color of egg shells
Time eggs left in beverage
Controlled Variables
Materials
1. Take three eggs and puncture holes on each end with a needle.
2. Blow the contents of the eggs out and wash the eggs off.
3. Make a cup of coffee by using a coffee maker, water, and coffee. Let the coffee sit for 3 hours until it is room temp.
4. Make a cup of black tea using boiling water and a tea bag. Let the tea seep for one minute and remove the bag. Let the tea sit for 3 hours until it is room temp.
5. Cut 3 pieces of tape about 1 inch long. Write with a pen cola on one. Wite coffee on another, and tea on the third.
6. Place the tape on the 3 cups.
7. pour room temp of coffee in one until you have 3/4 cup. Do this with the rest.
8. When you have done this, put the eggs in each cup and make sure its all covered.
9. record the color of the eggs every 7 days for a month.
April 12, 2014 - All eggs same white color
April 19, 2014- Cola darkest color- medium tan color- tea and coffee same- light tan color
April 25, 2014- Coffee, medium dark tan
tea- medium dark tan
cola- medium tan color
May 3, 2014- coffee, just slightly darkest tan- dark dark tan
Tea- dark tan
Cola- medium dark tan color
Observations
My hypothesis was incorrect. The egg shells placed in coffee and tea turned darker in color than the cola. The coffee and tea were about the same color after three weeks, but the coffee seemed just slightly darker. It must have more acidity and chromogens. I researched that coffee is lower in tannins than tea. Tea is high in tannins. You would think that the tea might be the darkest. It may be that i needed to keep the egg shells in the beverages longer or it was because egg shells were not a good substitute for teeth.
conclusion
Manipulated variable
The beverage: coffee, tea, or cola
Dependent variable
The amount of staining that occured to the egg shells
3 eggs
1 needle
3/4 cup room temperature cola
3/4 cup room temperature black tea
3/4 cup room temperature coffee
3-8 oz clear plastic cups
scotch tape
pen
measuring cup
paper towels
water
paper
Procedure
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