Assertion: saliva | /r/CapableOf | act as lubricant
Facets:
Source sentences:
text: Saliva also acts as a barrier and lubricant for the tissues in the mouth.
text: Saliva also functions as a lubricant, which helps chewed-up food slide down your esophagus and into your stomach, as well as a protectant for the delicate membranes that line your mouth and upper gastrointestinal system.