The hypothesis is that the toothbrush kept in Listerine solution will have the least bacteria.

You will prepare three agar petri dishes, disinfect three swabs, and label three toothbrushes. You will give each toothbrush a different treatment for five days, then take a sample from each toothbrush and roll it in the petri dishes. Finally, you will measure the size of the bacteria colony growth in each petri dish over five days.

You will need three agar petri dishes, three disinfected swabs, one bottle of disinfected water, three toothbrushes, one bottle of Listerine, one tube of toothpaste, and one marker pen.

The results showed that the petri dish with the toothbrush that was used with only water had the quickest bacteria growth. The petri dish with the toothbrush that was kept in Listerine had the least amount of bacteria growth.

This science project is interesting because it shows how different treatments can affect the amount of bacteria growth in a toothbrush.

To improve the reliability and accuracy of the results, a larger sample of participants should be used. This science project can also be repeated, this time taking a swab sample from the mouth after gargling with water, mouthwash, and Listerine and comparing the bacteria content.

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!