Yes, of course it does! Its the white frothy stuff that is in your mouth. You need it to make food wet so it is easier for your stomach to digest it.
It's from the salivary glands, not the mouth itself. And besides making food wet saliva contains amylase which begins the breakdown of carbohydrates.
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There are a few salivary gland in the mouth. the most dominant ones are the parotid glands.
The other dominate spot where saliva is secreted is right below the top of the tongue.
The part of the mouth that saliva comes from are the salivary glands. These glands are located in the cheeks at the bottom of the mouth.
Saliva is an enzyme created by the salivary glands. The enzymes break down the food so you can swallow it.