Sinus and Teeth

I've had an ongoing sinus infection for more than a year.  (I finally had to get an antibiotic because the jaw pain got so bad.)  Then, at my dental checkup, I had decay in three teeth--3,13,14--all on the upper jaw. (I only had three decayed teeth in the past 52 years, and now three more!)
To me it makes sense that infection in the body can spread to the teeth--especially when those teeth are on the same meridians as the sinuses.  But my dental hygienist insisted that the bacteria that cause tooth decay are not the same bacteria that cause sinusitis.  Pshaw!
I was reminded of an interesting tidbit from the book Cure Tooth Decay by Ramiel Nagel:  In the 1940's, there were two competing theories of tooth decay.  One, based on 1883 research by Dr. W.D. Miller claimed that bacteria in the teeth produce acid that erodes enamel.  (Dr. Miller, however, knew that the tooth's density and structure were its protection.)  The second theory, proposed by Dr. Albert Schatz, was called the proteolysis-chelation theory.  In this theory, "it is diet, trace elements, and hormonal balance that are key factors in triggering enzymes and tooth mineral chelation which results in tooth decay."
"In the 1940's, at an International Association of Dental Research meeting, the debate about the cause of cavities was put to an end.  By the power of vote Dr. Miller's acid / bacterial theory was adopted as fact despite contradictory evidence and theories [emphasis mine]."
I'm going with Dr. Schatz.