Defining the Normal Bacterial Flora of the Oral Cavity (NIH)
"The oral cavity is comprised of many surfaces, each coated with a plethora of bacteria, the proverbial bacterial biofilm. Some of these bacteria have been implicated in oral diseases such as caries and periodontitis, which are among the most common bacterial infections in humans."
What conditions may be linked to oral health? (Mayo Clinic)
"Diabetes reduces the body's resistance to infection - putting the gums at risk. Gum disease appears to be more frequent and severe among people who have diabetes. "