I don't know if you have had such an embarrassing experience. It's inevitable that you will be sleepy during the day. At this time, many people will choose to lie on the table with their arms for a while.
After sleeping, I woke up and found saliva on my arm. I leaned over and smelled it. There was a fishy smell!
Why does saliva stink? When couples kiss, don't they think each other's saliva stinks?
Don't be shy, I'll tell you the answer!
It turns out that saliva in our mouths generally has no smell. It will smell only after contacting the air.
This is because more than 98% of the saliva is water, and the rest is digestive enzymes and protein.When the saliva leaves your mouth, the water will be evaporated, and a series of reactions will occur between microorganisms in the air and various enzymes in the saliva.
In fact, we adults secrete 1000ml-1500ml saliva every day, which has a lot of effects on our body. It can not only change the humid environment inside the mouth, but also help us digest, sterilize and clean, so don't discriminate against it~
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Original link:Popular science China