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Is this a good method for testing which mouthwash kills the most bacteria?

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 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? Please help! Thank you!

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Yes, that will work, I guess. But keep the petri dishes warm, too. Else it takes to long and you have all sorts growing in there.
You could also test the effectiveness of a mouth wash as such. Take a sample out of your mouth, then another after using the mouth wash, and find out what difference it makes.

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