[johnea]

This one only discusses the benefits of the microbiome in broad terms, but it has a bunch of interesting introductory info:

https://pmc.ncbi.nlm.nih.gov/articles/PMC6503789/

tl;dr > The oral microbiome usually exists in the form of a biofilm. It plays a crucial role in maintaining oral homeostasis, protecting the oral cavity, and preventing disease development.

That NIH article also refers to some fields that are experiencing wide recent advances: the gut/brain axis, and communication from the skin microbiota that stimulates the first immune responses to pathogenic organisms.

This link describes some aspects of the skin microbiome:

https://www.news-medical.net/news/20250402/How-your-skine280...

I up-voted your post. I don't think there should be a penalty for asking for a reference. Although, I'm not always in the mood to dig up _good_ links on subjects that I've read enough to form an opinion.