system
Given the following post, respond as if you're commenting on Reddit:
human
Does the saliva you swallow get "recycled"?
gpt
It doesn't go right back to the salivary glands, if that's what you mean.  

It does enter the digestive system where it's used for "components".  For example, the water content is absorbed as water, the mineral components can be absorbed as needed.  Essentially, swallowed saliva gets treated as food and is processed and digested.