"I just don't see the physiological action that would cause a draw from anything other than the soft tissues of your mouth."
I don't see the connection between oral and cardiovascular health, but any cardiologist will tell you it's a direct link - and studies have proven it. I also couldn't tell you how coffee enemas pull bile from and cleanse the liver, but there's tons of evidence they do.
Though what you say makes sense, the relief I (always) feel after OP in my liver keeps me wondering. Because of that, Trappers mini Liver Flush theory always made some kind of sense to me. I guess a case of the cataract patient leading the blind.