A sialogogue is something that causes prompt increase in
flow of saliva. I have read of a folk medicine test
for mumps: just exhibiting a lemon to a child with swelling
below and anterior to earlobes can cause salivation and pain. I was reminded of this by xerostomia (dry mouth)
interfering with sleep. Just holding an antacid tablet unchewed between teeth and cheek relieves it. I have heard
of hunters putting a small clean pebble in mouth for same
purpose.