In ten years we will look back and wonder why we were so reluctant to act on the evidence we have today, linking gum infections with heart and lung disease, dementia and certain cancers. The research has clearly established the link. This is irrefutable.
The final controversy lies in whether or not treating your gum disease will really decrease your risk of systemic disease. Unfortunately, this will take a long time to prove beyond any doubt, even though more and more researchers are convinced and actively gathering evidence.
In the meantime, I believe the prudent thing is to eliminate gum infections and free up your immune system to support a healthy heart and mind. The treatment is relatively inexpensive and easy. It does require a lifestyle change but the benefits go far beyond eliminating bad breath and keeping your teeth for the rest of your life.