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Staining of teeth by beveragesFeatured science projectScience project video


The materials required for this science fair project:

-    5 teeth
-    1 cup of coffee
-    1 cup of tea
-    1 cup of grape juice
-    1 cup of red wine
-    1 cup of Coca-Cola
-    1 toothbrush and 1 tube of toothpaste
-    1 sheet of paper
-    1 black marker
-    1 stopwatch


1.    For this science fair project, the independent variable is the type of beverage used to stain the teeth. The dependent variable is the degree of staining on the tooth. This is determined by comparing the stains on the teeth after removing them from the beverages. The constants (control variables) are the temperature of the beverages, the whiteness of the teeth used and time the teeth are left in the cup.

2.    Brush the 5 loose teeth with the toothbrush and toothpaste until all the teeth reach a similar color.

3.    Fill 5 cups with coffee, tea, grape juice, red wine and Coca-Cola. Drop a tooth into each cup and set aside for 3 minutes. Then, remove the teeth, wipe dry, and place on a sheet of  paper. Label each tooth for the beverage it was placed in.

4.    Compare the discoloration and staining on each tooth. Rank the teeth according the degree of staining, with 1 being the most discolored and 5 being the last discolored.

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Complexity level:
Project cost ($):
Time required:
1 hour for preparation, 1 hour for the science fair project experiment
Material availability:
A dentist might be able to provide the teeth required for this experiment
Safety concerns: