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Bacteria in your toothbrushFeatured science projectScience project video

Observation

The results show that the petri dish A had the quickest bacteria growth. Toothbrush C (dipped in Listerine) had the least amount of bacteria growth.

Petri Dish type

Size of bacteria growth (mm)

Day 1

Day 2

Day 3

Day 3

Day 5

A - water

0

8.9

19.5

34.3

51.2

B – toothpaste

0

4.1

8.3

12.7

22.1

C – Listerine dip

0

0

1.9

3.2

6.3

The graph below represents the results of our science project experiment.

bacteria in toothbrushes science project
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Complexity level:
7
Project cost ($):
20
Time required:
5 days to prepare, 5 days for science fair project
Material availability:
Easily found
Safety concerns:

Basic safety requirements