2 links have been added on this idea.
  1. According to this study, human saliva can also promote faster healing of skin wounds.
    https://www.frontiersin.org/articles/10.3389/fbioe.2020.00999/full

  2. These researchers are studying how saliva can be used to treat antibacterial-resistant infections.
    https://twin-cities.umn.edu/news-events/treating-antibiotic-resistant-infections-peptides-inspired-human-saliva