Every time a new longevity bestseller appears, I do the same thing: I flip to the index and look for entries like “oral health,” “periodontal disease,” “gum disease,” or “oral microbiome.”
Almost never there.
And every time I close the book and wonder: How is this possible?
Your mouth sits in your head, directly connected to your bloodstream and home to more than 700 bacterial species—the second most diverse microbiome in the body. Yet the people shaping the longevity conversation often act as if it doesn’t exist.
I’ve spent nearly 40 years connecting what happens in the mouth to the rest of the body. The evidence is strong and consistent. The mainstream discussion simply hasn’t caught up.
Here’s a concise head-to-toe tour of how oral health influences the body—and why it matters for longevity.
Your Brain
Porphyromonas gingivalis, a bacterium linked to gum disease, has been detected inside the brains of people with Alzheimer’s. In animal studies, infection with this oral pathogen led to colonization of the brain and triggered production of amyloid-beta, the characteristic plaque of Alzheimer’s disease (Dominy et al., Science Advances, 2019). This connection is not merely correlative; the pathogen and its toxic enzymes have been physically identified in brain tissue.
This research is personal for me—both my parents had Alzheimer’s—so I take oral health seriously. I also take steps I believe support brain health, like supplementing with creatine based on emerging research into brain energy metabolism and neuroprotection.
Your Heart
Periodontal bacteria have been found inside arterial plaque, the same buildup that causes heart attacks and strokes. One study detected oral pathogens in nearly half of arterial plaque samples from surgery patients (Haraszthy et al., Journal of Periodontology, 2000). The American Heart Association has acknowledged the association between periodontal disease and atherosclerotic cardiovascular disease (Lockhart et al., 2012).
When was the last time your cardiologist asked about your gums?
Your Blood Pressure
Some oral bacteria—especially those on the back of the tongue—convert dietary nitrate from leafy greens and beets into nitrite, a precursor to nitric oxide, which helps dilate blood vessels and maintain healthy blood pressure. Antiseptic mouthwashes can kill these bacteria. In one study, mouthwash reduced oral nitrite production by 90% and raised blood pressure within a day (Kapil et al., Free Radical Biology and Medicine, 2013).
Maintaining the right oral bacteria is important for nitric oxide production. I prioritize minerals like magnesium to support blood pressure and tooth health, stay hydrated to support saliva production, and use gentler options for oral care that preserve beneficial bacteria.
Your Blood Sugar
Periodontal disease and diabetes form a bidirectional relationship: each can worsen the other. Treating gum disease has been shown to improve blood sugar control, with HbA1c reductions comparable to adding a second diabetes medication. International consensus now recognizes periodontal care as part of diabetes management (Sanz et al., J Clin Periodontol, 2018; Madianos & Koromantzos, 2018).
If you are prediabetic or managing diabetes, your dentist may be an important partner alongside your endocrinologist.
Your Breasts
Research links chronic gum inflammation to higher cancer risk. A meta-analysis of more than 173,000 people found women with periodontal disease had a 22% higher risk of breast cancer; another study of over 73,000 postmenopausal women showed a 14% increased risk (Shao et al., Frontiers in Oncology, 2018; Freudenheim et al., 2016). Chronic, low-grade systemic inflammation arising from periodontal disease can promote cancer progression.
Managing systemic inflammation from multiple angles—nutritional strategies and careful supplementation—can be part of a broader plan to reduce inflammatory load.
Your Gut
The gut microbiome begins in the mouth. You swallow roughly 1.5 liters of saliva every day, and if your oral microbiome is imbalanced, pathogenic oral bacteria can colonize the gut. In a key study, oral Klebsiella species drove severe intestinal inflammation when they colonized a disrupted gut (Atarashi et al., Science, 2017).
Probiotics alone won’t fix the problem if pathogenic oral bacteria continuously seed the gut. Oral health is a foundational part of gut optimization.
Why Isn’t the Mouth Part of the Main Conversation?
Dentistry has been siloed from medicine for more than a century and a half. Insurance and training reinforce that separation: medical education often gives little attention to oral health, and dental education often gives little attention to systemic health. The mouth is rarely treated as an integrated systemic organ.
The major chronic diseases—cardiovascular disease, cancer, neurodegenerative disease, and metabolic disease—are consistently linked to periodontal disease, yet oral health rarely appears in mainstream prevention frameworks.
That gap is one reason I’m writing a book to bring this science to a wider audience and reframe the mouth as an integral part of whole-body health. If you’d like to be involved in the book launch team, reply and let me know.
Practical Steps You Can Take Today
Find a dentist who understands oral-systemic connections. Not every dentist is trained in airway science, the oral microbiome, or systemic links. Seek out a practitioner who focuses on these areas.
Get an airway evaluation.
Airway health affects sleep quality, blood pressure, facial development, inflammation, and long-term cognitive risk. Mouth breathing in children can lead to narrower jaws and chronic sleep problems, and many adults have undiagnosed sleep-disordered breathing that raises cardiovascular risk. Dentists often are well-positioned to spot airway issues during routine visits.
Stop nuking your oral microbiome.
Avoid antiseptic mouthwashes that disrupt beneficial bacteria. Consider gentler alternatives such as oil pulling or mechanical cleaning with a tongue scraper, or use no antiseptic rinse at all. Preserving beneficial oral bacteria supports overall health.
Treat bleeding gums as a systemic red flag.
Bleeding when you floss is not normal—it’s an open wound that connects to your bloodstream, brain, and heart. Make flossing a daily habit and see your dentist regularly for checkups and cleanings.
Rebuild enamel, don’t just clean it.
I spent years looking for a toothpaste designed with the oral microbiome in mind—free of harsh detergents and disruptive essential oils. When I couldn’t find one, I developed a formula focused on rebuilding enamel while supporting a balanced oral ecosystem.
The Fifth Pillar
Heart disease, cancer, neurodegeneration, and metabolic disease are widely recognized as the major pillars of chronic illness. After four decades of practice, I believe there’s a fifth pillar: oral disease.
Oral disease is the most common chronic condition worldwide, it’s linked to the other four pillars, and it’s something you can act on daily at home without a prescription.
I’m not promising immortality, but I want to make the years we have healthier and better. Thank you for reading and caring about this topic.
To your health,
Mark
Citations and Further Reading
– Dominy et al., Science Advances (2019) — P. gingivalis gingipains in Alzheimer’s brains
– Haraszthy et al., Journal of Periodontology (2000) — Periodontal pathogens in 44% of atheromatous plaques
– Lockhart et al., Circulation (2012) — AHA statement on periodontal disease and atherosclerotic cardiovascular disease
– Kapil et al., Free Radical Biology and Medicine (2013) — Mouthwash reduces nitrite production 90% and can raise blood pressure
– Sanz et al., J Clin Periodontol (2018) — EFP/IDF consensus on the diabetes–periodontitis relationship
– Madianos & Koromantzos, J Clin Periodontol (2018) — HbA1c reductions of 0.27%–1.03%
– Shao et al., Frontiers in Oncology (2018) — Periodontal disease associated with increased breast cancer risk (173,162 participants)
– Freudenheim et al. (2016) — Study of 73,000+ postmenopausal women showing a 14% increased breast cancer risk
– Atarashi et al., Science (2017) — Oral Klebsiella colonizing the gut drives TH1 inflammation