Science fair project testing which toothpaste removes stains best using stained eggs.

This is a science fair project titled "Which Toothpaste Removes Stains Best?". Let's break down the components of the project and analyze the experiment, its hypothesis, procedure, results, and conclusion.

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🔬 Project Overview

The student investigated which toothpaste is most effective at removing stains from eggs, using them as a model for stained teeth.

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🧪 Hypothesis

> *"If a egg soaks in soda then it would contain a lot of dye and sugar."*

- This is actually a statement about the egg-soaking process, not a direct hypothesis about toothpaste effectiveness.
- The real hypothesis seems to be implied: *Toothpastes with similar chemical compositions to tooth enamel (like fluoride) will remove stains better.*

But the student later says:
> *"My hypothesis was incorrect because I thought it would have been Optic White."*

So, the actual hypothesis likely was:
> *"Optic White toothpaste will remove stains best."*

And the results showed otherwise.

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🛠️ Procedure

1. Put an egg in a cup and soak it in soda for 24 hours.
2. Take the egg out and let it dry.
3. Brush the stained egg with different toothpastes.
4. Determine which toothpaste removes stains best.

✔ This is a controlled experiment testing stain removal.

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🧫 Materials Used

- Eggs
- Soda (to stain the eggs)
- Toothpastes tested:
- Colgate Total
- Crest Whitening
- Sensodyne
- Macleans
- Optic White

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📸 Visual Evidence

There are before-and-after photos of eggs:
- Each egg is shown before brushing (stained).
- After brushing with each toothpaste, the egg is photographed again.
- The clearest result appears to be with Sensodyne, which shows the most noticeable stain removal.

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📊 Results

> *"The Sensodyne toothpaste removed the stains the best."*

Even though the student expected Optic White to work best, Sensodyne performed better.

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✔ Conclusion & Explanation

- Hypothesis was incorrect — Optic White did not perform best.
- Sensodyne was the most effective at removing stains.
- Possible reason: Sensodyne contains ingredients that may be more effective at breaking down or polishing away stains (e.g., fluoride, abrasives, or desensitizing agents).

Also, the student includes a scientific explanation:
> *"Toothpaste has a similar chemical composition to tooth enamel... When we brush an eggshell with toothpaste, it strengthens the shell and protects it from acid, just like it does for our teeth."*

This shows understanding of how toothpaste interacts with surfaces.

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💡 Scientific Strengths

- Clear hypothesis and prediction.
- Controlled variables (same egg type, same soaking time, same brushing method).
- Visual data (photos) make results easy to interpret.
- Real-world relevance (tooth staining and whitening).

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📌 Final Answer:

> Sensodyne toothpaste removed stains the best in this experiment, even though the student initially hypothesized that Optic White would be most effective.

This project demonstrates scientific thinking, experimentation, and the importance of testing assumptions through evidence.

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✔ Key Takeaway:

Scientific inquiry involves forming hypotheses, testing them, and accepting results even when they contradict expectations. That’s what makes science powerful!