Diagram of Three Circles

As a follow up to the request for a diagram of the three circles mentioned in my first article, here is a link showing what Keyes's Circles look like.  Label one circle Host (teeth), another Substrate (sugar) and the third Bacteria (bugs).  Where they overlap in the middle (red) is Dental Disease.  It takes all three for the disease process to occur; one or two isn't enough.  These circles can also be used for other disease processes and areas where research is being done. Hope this helps.