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The Effects of Phosphoric Acid on Tooth Enamel

The Effects of Phosphoric Acid on Tooth Enamel | Science Fair Projects | STEM Projects
Ever wondered if the acid in soda can really cause tooth decay? In this experiment, you'll find out by testing different levels of phosphoric acid on tooth enamel.


The hypothesis is that if the concentration of the mixture is stronger, more tooth enamel will be lost.

Method & Materials

You will autoclave teeth, weigh them, mix different levels of phosphoric acid solutions, and leave the teeth in the solutions for 7 days.
You will need 15 wisdom teeth, 1 can of Pepsi, 1 can of Coca-Cola, 1 pH meter, 1 MagneStir Mixing bar, 1 analytical balance, 1 drying oven, 1 vacuum oven, 1 autoclave, 1 desiccator, and all safety clothing.


The results of the experiment showed that when the solution with the most reactant (solution/ group # 5) was tested against the teeth, more tooth enamel was etched away, compared to the solutions/ groups or one or two. Also the teeth in Group 5 weighed less than the teeth in Group 2.

Why do this project?

This science project is interesting and unique because it tests the effects of phosphoric acid on tooth enamel, which is an important factor in understanding how soda can affect teeth.

Also Consider

Variations to consider include testing different types of soda, testing different concentrations of phosphoric acid, and testing different lengths of time for the teeth to be in the solutions.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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