What is the content of saliva?

it contains little acid from your stomach (but not enough burn a hole through anything though)

2nd Answer:

Two things: First, the above answer is a total guess and mostly wrong.

Second, saliva contains water, mucus, a couple of enzymes, alpha-amylase (which may start digestion of starches) and a few proteins.

Saliva also is a small part of the immune system, containing a globulin, which discourages germs from surviving.