In fact, it is wrong to say that the first glass of water in the morning is equivalent to drinking bacteria.Most of the bacteria in our mouth are harmless, so swallowing them with saliva has no impact on our health.
Furthermore, the bacteria from our mouth cannot directly enter the bloodstream after being ingested. They are blocked by the gastrointestinal tract and most of the microorganisms entering the stomach are killed by stomach acid. Very few bacteria survive this process.
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