Toothbrush Tryouts
Human Health and Behavior
Grayson Cross
- Grade:
- 7
- Teacher:
- Georgina Matzkin
My science fair, Toothbrush Tryouts, is about if an electric or manual toothbrush cleans more plaque off teeth. I choose this project because I have an electric toothbrush and I want to make sure im cleaning my teeth the best I can. My conclusion to my science fair is that electric toothbrushes do slightly better at cleaning plaque off of teeth. My project is important because teeth are important and so we want to keep them clean and plaque free.
Very interesting and insightful conclusions. The observed differences between males and females are particularly intriguing and could lead to meaningful follow-up research. I also appreciate the reflection that a larger sample size would likely produce more accurate and generalizable results.
You chose a great everyday question and turned it into a thoughtful experiment. Your use of plaque disclosing tablets, before‑and‑after photos, and a scoring system shows strong scientific effort. Your data table and graph make the results easy to understand, and your conclusion clearly connects back to your hypothesis. It’s wonderful to see you thinking about how to improve your experiment in the future. Keep exploring questions that matter to you—your curiosity and careful work really shine in this project!
This project asks a practical question that many households think about when choosing cleaning products. The use of petri dishes and bacterial colonies makes the investigation feel very scientific because the results are based on visible evidence rather than just opinion. It was interesting to see that the homemade cleaner showed fewer colonies, especially since the original expectation was that the chemical cleaner would perform better. The explanation connecting vinegar and citrus acids to cleaning properties was also helpful for understanding why the homemade mixture might work. One improvement could be to test additional brands of chemical cleaners or repeat the trials to see if the same pattern appears again. This study does a nice job connecting microbiology with real life choices people make in their homes.