A company in Pittsburgh called Demegen have been trying to harness the natural healing component found in saliva called histatin but don't know how further forward they are on research or getting a product out..
it's specifically with the view of creating a mouth rinse / spray /ointment to address oral fungus and yeast infections in those with compromised immune systems..maybe for those who lack saliva production may benefit too..on average a person consumes 2-3 pints a day!! thats a lot of spit to drink!
Aside from spit being a lubricant and a neutraliser,certain components in spit work against infection by disrupting cell walls of some bacteria, and have antibodies to give mucosal immunity.
Lysozyme (found in egg whites) is a mild antiseptic, and salivary immunoglobulin A are just two other useful healing components ...oplorphin is another which has pain releaving properties 6x more than morphine apparently!
the research reports on the enzymes are far too technical for me to grasp..but always considered whether or not some peoples saliva was different, an enzyme lacking or compromised (as in hiv patients..which suffer from oral yeast often?) Is the ph of the saliva's environment adequate for promoting these enzymes function and thus overall optimum oral and lip health?