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Will this method for testing which mouthwash kills bacteria the best work? Please help!!?

I'm going to collect oral bacteria and swab it on a petri dish with agar. I will soak a small square or circle of tissue in one mouthwash and place it in the middle of the petri dish. Then I will close it and I don't have an incubator, so I'm just going to put them in a dark place (a closet) and measure the zone of inhibition or "kill zone" over the course of 5 days. Is that a good way to do it? Will I just kill the bacteria? This is for the science fair.Please help! Thank you!

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Well, if that is your project, then whatever the outcome may be is the ending. But if you want to show results of the bacteria actually dying, then try using several different things to kill it off. Like the mouthwash, of course, and then maybe some kitchen supplies? But if you do that people might get the idea that using bleach is a better way to kill bacteria in your mouth... But I think what your doing right now is good, just have more than one subject. Maybe two different types of mouthwash would be good! Make sure you get your measurements and temperatures all the same! Good luck in the science fair :)

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I would also do a contrast between one that has no mouthwash. And measure the growth difference.

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