The dentist you choose helps shape your long-term health. If you missed them, see Parts 1 and 2 for more context. This is Part 3 of 8 — today we focus on the link between oral health and blood sugar.
Imagine two people: same age, similar genes, comparable diets. One sees a dentist who treats the mouth as part of the whole body and seeks root causes. The other visits a conventional drill-and-fill dentist who primarily addresses immediate dental problems. The difference in outcomes can be striking.
Research shows that treating gum disease in people with diabetes improves their blood sugar control. A 2022 Cochrane review pooled 35 trials including more than 3,000 people with diabetes and found that effective periodontal treatment lowered HbA1c by roughly 0.4 percentage points. That magnitude of change is similar to what some medications produce — and it came simply from getting the gums healthy again.
The relationship goes both ways. Chronic gum infection and the inflammation it produces make blood sugar harder to control by worsening insulin resistance. That creates a vicious cycle: rising blood sugar fuels inflammation, and inflammation worsens blood sugar control. Too often, care addresses only one side of that loop.
It’s not only the gums that matter. The bacteria that live on your tongue and elsewhere in the mouth play a role in metabolic health. Certain oral bacteria help convert dietary nitrate — abundant in leafy greens — into nitric oxide, a molecule that improves blood flow and helps muscles remove glucose from the bloodstream. People with more of these beneficial bacteria tend to have better insulin sensitivity. Yet many common oral-care practices, including some alcohol-based mouthwashes, can reduce these helpful microbes when they are most needed.
Prediabetes affects a large portion of the adult population. In the United States alone, tens of millions of adults have blood sugar levels that place them in the prediabetic range, and the majority are unaware because their levels are not yet high enough for a formal diagnosis. Even modest elevations in blood glucose can damage gum tissue and contribute to periodontal disease, so undetected metabolic dysfunction can quietly undermine oral health.
Because of this interplay, your dental and medical providers should coordinate: dentists should consider blood sugar when evaluating persistent gum problems, and physicians should inspect the mouth and ask about oral health. When the two disciplines communicate, patients get more complete care and a better chance of breaking the cycle.
In our two-person example, the patient seeing the whole-body dentist receives the expected periodontal therapy, but the care team goes further: the dentist asks about symptoms of high blood sugar, orders or requests an A1C, and communicates with the patient’s doctor. As a result, both the gums and the underlying metabolic issue are addressed. The other patient remains trapped in a loop: repeated dental cleanings without attention to blood sugar, and medical management of glucose without recognition of oral inflammation. Both conditions worsen over time.
What can you do to protect both your mouth and your metabolism?
1) Tell your dentist if your blood sugar is high, if you have been told you are prediabetic or diabetic, or if your glucose has been creeping up. This information changes how your dentist monitors and treats your gum health.
2) Ask your doctor to check your blood sugar if your gums bleed persistently or your oral health is declining despite treatment. Your dentist and doctor are addressing the same physiological problems from different angles and should coordinate care.
3) Track metabolic markers annually. Useful targets to discuss with your clinician include fasting insulin, fasting glucose, and A1C. Lower values within the recommended ranges are generally better for both systemic and oral health; talk to your provider about specific goals appropriate for you.
4) Consider supplements carefully. Some supplements and botanicals have been studied for their effects on blood sugar and inflammation. For example, berberine has been used to help steady post-meal blood sugar and may have beneficial effects on gut bacteria and inflammation that tie into both insulin resistance and periodontal disease. Because supplements can interact with medications, discuss them with your doctor before starting anything new.
5) Support cellular energy and healing. Nutrients that support cellular energy production, tissue repair, and antioxidant defense can be helpful for the gum tissues and for metabolic health. For example, coenzyme Q10 is one compound that is important for cellular energy and has been studied in both oral health and metabolic contexts. If you take medications such as statins, your doctor can advise whether supplementation might be appropriate.
By recognizing the links between oral inflammation and metabolic health, you and your care team can intervene earlier and more effectively. Treating gum disease can help improve blood sugar control, and improving blood sugar can make gum treatment more successful. Coordinated care breaks the cycle and supports long-term health.
Next week we’ll continue with Part 4. Take care,
Dr. B
P.S. A few practical products and habits I use to support oral and oral-microbiome health:
- Hydroxyapatite toothpaste as a fluoride alternative for remineralization
- An oil-pulling blend used occasionally instead of alcohol mouthwash to avoid disrupting beneficial oral bacteria
- Regular green tea consumption for its antimicrobial and antioxidant properties
- Digestive enzymes with meals when needed to support digestion and nutrient absorption
- Magnesium taken in the evening to support sleep and overall metabolic health