Right on the money with the checkups. This is really wordy but I really want to help for some unkown reason. In a nutshell:
1. Brush teeth morning/night and floss at least once 2. rinse after meals; especially after sugar and grainy carbs 3. use antiseptic mouthwashes 4. kick me off this computer so I shut the... and go brush/floss/rinse/gotosleep.
The mouth (nose and eyes) is an interesting little place that technically isn't 'inside' the body but in some places is only 1 little cell membrane thickness away from literally being INSIDE the messy red goo of your bloodstream!
Once in there, bacteria are more than happy to do what all living things would like to do at least once ...(according to that catchy song "You and me baby ain't nothing but mammals"...and The Discovery Channel) and that is procreate!
This is why 80% of oral bacteria (strep among the most well known) live on the 'gag zone' on the back of the tongue. (There is a great video on Yahoo answers)
I can't stress enough the importance of oral hygeine at least in the morning and after dinner (especially following sugars and carbohydrates such as grains like rice, bread, potatoes, and pasta) where enzymes in saliva DIGEST the leftovers and leave bacteria poo behind. I thought it was a dog or something but nope.
Now this is crazy: So b/c strep is ALWAYS there, if it's not kept in 'check' with brushing/flossing /tongue scraping/ antiseptics, it can cross into the bloodstream (septic) and latch on to the smooth heart valves causing them not to seal properly (heart murmor). This is irreversable without surgery. This is very common and strep symptoms (white tongue, sore throat, swollen lymph glands under the chin) will go away after several days though leaving the heart damage forever.
Yellow teath and plaque buildup of course lead to lonliness via bad breath and lack of teeth ala gingavitis and not to mention cavities ESPECIALLY if you drink unflourinated H20 ie: spring water or charcoal filtered water. Andy Rooney of 60 minutes has a funny little video here: http://www.cbsnews.com/stories/2005/10/13/60minutes/rooney/main939291.shtml
Finallyand scariest of all: these bacteria are to believed to be a leading cause in the progression of Artherosclerosis leading to the #1 & #3 leading causes of death