Eli5: If there are billions of bacteria in our body, why is it bad for someone to just pop some anti biotics even without being sick

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Antibiotics kill bacteria. There are billions of bacteria in our body. Why is it drug abuse if I just decide to toss in a few in my mouth, without being sick, since there would always be bacteria to kill

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the bacteria you’re talking about is called probiotic bacteria. they keep our bodies working well, they’re beneficial to us. like e. coli, they live in intestine to use nutrients that some bacteria needs to live or survive and by doing so they’re making it harder for more harmful bacteria to grow.

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