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Staining of teeth by beveragesFeatured science projectScience project video


This science fair project was performed to compare the amount of stains left on our teeth by the beverages we drink. The tests were done by comparing the effects of coffee, tea, grape juice, red wine and Coca-Cola, when exposed to tooth enamel.


Coffee will leave the most stains on our teeth.

Scientific Terms

Teeth whitening, intrinsic stains, extrinsic stains, malnutrition


Teeth staining

The natural color of our teeth is light grey or light yellow. Teeth whitening solutions can help our teeth become whiter. However, some of the food and beverages we consume daily can stain and discolor our teeth.

There are two types of teeth stains, namely intrinsic stain or extrinsic stain. Intrinsic stains are caused by age, malnutrition, infections or genetic reasons. Extrinsic stains are more manageable. They are caused by the food and beverages that we consume. These stains are merely cosmetic and can be removed by proper dental care.

The staining of our teeth due to plaque can be easily removed by regular brushing, flossing and visiting the dentist. Food that leaves stains on our teeth includes berries, soy sauce, chili sauce and curries. Beverages that leave stains are coffee, tea or coke. These stains can also be easily removed by brushing our teeth.

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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: