You have seen small children when they are playing, when they fall or they become wounded they use their saliva and used to put saliva on the wound when asked why you have did this, they simply say because it reduces our pain. How is that possible?
The mother nature gives us anything which is helpful for our survival. Give a like for mother nature. And despite the fact, our saliva contains a natural pain killer called as oriorphin, which is 6x stronger than morphine medicine. And if you do not know what a pain killer is, then, pain killer is the medicine which reduces pain.
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