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Project title How dirty are your dental retainers? Featured science projectScience project video
Difficulty Level High school
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Should you brush your retainers with toothpaste? Will it suffice to rinse them with mouthwash? This science fair project aims to investigate the methods available for minimizing the amount of bacteria found on dental retainers. This experiment is carried out by comparing the amount of bacteria found on dental retainers that have been subject to infrequent brushing, regular brushing with toothpaste and soaking in mouthwash.  

Instructions preview
1. Tthe independent variable of this experiment is the conditions of which the dental retainers are subject to – non brushing, brushing with toothpaste and rinsing with mouthwash The dependent variable is the amount of bacteria growth in the relevant Petri dish. This is approximately determined by measuring the size of bacteria growth using a ruler. The constants (control variables) are room temperature, amount of sunlight and the ingredients in the Petri dish agar. 2. Prepare 12 Petri dishes of agar and store them in the refrigerator. Bring them to room temperature before the start of experiment by taking .....
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