By Dr. Mohamed Assaggaf — Periodontist and Implantologist, AQUA Dent Clinics; Faculty Member, Department of Periodontics, King Abdulaziz University Faculty of Dentistry, since 2010.
Patients often ask me why a periodontist cares about their blood sugar. The short answer: your gums and your pancreas are talking to each other every day, and they have been for years before either of us notices. The longer answer is the reason I have spent much of my research career — from my early training at Boston University’s Goldman School of Dental Medicine and the Forsyth Institute, to my current work at King Abdulaziz University — studying the relationship between glycated hemoglobin (HbA1c) and periodontal disease. In this piece I want to share what that research has taught me, what I look for in the dental chair that a blood draw alone cannot reveal, and what this means for you as a patient in Saudi Arabia — a country where the prevalence of type 2 diabetes and advanced periodontal disease is among the highest in the region.
A two-way street, not a one-way symptom
For decades, dentists described periodontal disease as a “complication of diabetes.” That framing is half right and half outdated. The current evidence, and my own clinical experience, is clear: the relationship is bidirectional. Poorly controlled blood sugar makes periodontal disease worse, and untreated periodontal inflammation makes blood sugar harder to control. Chronic inflammation in the mouth does not stay in the mouth. Inflammatory mediators — such as TNF-alpha, IL-6, and C-reactive protein — enter the bloodstream from inflamed periodontal pockets and contribute to the insulin resistance that drives HbA1c upward. In a diabetic patient with untreated periodontitis, the gums are effectively a chronic, low-grade wound roughly the size of the palm of your hand, leaking inflammatory signal into the circulation around the clock.
This matters because HbA1c — the average that endocrinologists rely on, reflecting three months of blood sugar — responds to everything that raises systemic inflammation, not only what you eat.
What your gums are saying before you feel sick
Here is the part patients find surprising. Periodontal changes often appear years before a person is diagnosed with type 2 diabetes. In a recent study I co-authored, published in PLOS ONE in 2023, we examined the association between HbA1c and periodontitis stage in adults who had not yet been diagnosed as diabetic. The finding was uncomfortable and clinically important: even within the non-diabetic range, higher HbA1c values correlated with a more advanced stage of periodontitis. Put plainly, the gums were already registering the metabolic stress before it crossed the diabetic threshold on paper.
When I sit a patient down in our AQUA Dent clinic in Jeddah and I see certain signs, my radar goes up. These are the features that make me ask carefully about their last blood test:
- Unexplained generalized bleeding that does not respond to basic hygiene improvements over two to four weeks.
- Rapid bone loss seen on radiographs in a patient whose plaque levels do not justify that severity.
- Recurring periodontal abscesses, especially in more than one quadrant of the mouth.
- Delayed healing after a simple cleaning appointment, or an extraction socket that stays inflamed past the expected window.
- Fungal overgrowth — oral candidiasis in a non-smoker, non-denture wearer, non-immunocompromised adult.
- A distinctive sweet, fruity breath (ketotic odor) that the patient or their spouse mentions in passing.
- Gingival overgrowth patterns that do not match the patient’s medication list.
None of these signs alone proves diabetes. But in combination, in the right patient, they shift the probability enough that I will write a formal referral note that same day.
What a periodontal exam reveals that a blood test does not
An HbA1c number is a snapshot of the last 8–12 weeks of average glucose. It is useful, but it is silent about two things: duration and biological response. A periodontal exam reveals both.
When I probe six sites around each tooth and map pocket depths, clinical attachment levels, furcation involvement, and bleeding on probing, I am reading a longitudinal record written into your tissues over years. Bone loss does not happen in three months. Advanced attachment loss in a 38-year-old tells me that something — often metabolic — has been wrong for a long time, whether or not today’s blood test catches it. Conversely, a patient with a borderline HbA1c of 6.3 and pristine gums has a completely different risk profile from a patient with the same number and generalized stage III periodontitis. The tissues tell me how their body is actually responding to the metabolic stress, not just what the average is.
That is why I often describe the periodontal chart as a “biological HbA1c” — it integrates years of inflammatory burden into a single readable map.
Why this matters especially in Saudi Arabia
The Kingdom carries a particularly heavy load here. National data consistently place adult diabetes prevalence in the high teens to low twenties percent range, with pre-diabetes substantially higher. Advanced periodontitis is also widely prevalent, and through my work studying Saudi populations I have repeatedly seen the same pattern: a patient who comes in for a “routine cleaning” and leaves with a referral letter to their primary care physician. For a Jeddah-based clinic, this is not an edge case. It is a weekly occurrence.
There is also a cultural factor worth naming honestly. Many people see a dentist more often than they see a general physician, especially younger working adults. That makes the dental chair, in practical terms, one of the most frequent touchpoints with the healthcare system for a person in their 30s or 40s who otherwise feels well. A periodontist who knows what to look for is, whether the patient realizes it or not, an early-warning station.
Practical at-home care if you know or suspect you are at risk
If you already carry a diabetes diagnosis, or if your last HbA1c was in the pre-diabetic range (5.7–6.4), the daily arithmetic of your gum care changes. I ask my patients to commit to a short, non-negotiable list:
- Brush twice a day with a soft-bristle brush for a full two minutes. Electric toothbrushes, in my experience, reduce bleeding more reliably than manual brushes for this group.
- Clean between your teeth daily. Floss if you already floss well; otherwise use interdental brushes sized to your gaps. The plaque that matters most sits where a brush cannot reach.
- See a hygienist every three to four months, not every six. Diabetic and pre-diabetic patients re-form calculus faster and inflame faster. Six-month recalls are written for healthy adults.
- Tell your dentist your latest HbA1c at every visit. If it has moved up or down by half a point, our treatment plan may move with it.
- Stop smoking in all its forms, including vaping and shisha. In a diabetic patient, smoking does not add risk — it multiplies it.
- Rinse with water after sugary drinks rather than brushing immediately. Repeated acid exposure softens enamel, and brushing on softened enamel causes wear.
When I refer to endocrinology
I refer when a patient’s periodontal picture does not match their documented medical history, and the discrepancy cannot be explained by smoking, medications, or genetics. I also refer when a known diabetic patient presents with periodontal deterioration despite good oral hygiene — because that usually means their glycemic control has drifted, even if their last lab was reassuring. The referral is short, written, and addressed to their physician by name wherever possible. I include pocket depth ranges, the pattern of bone loss, and one sentence on why I think a metabolic re-evaluation is warranted. Physicians, in my experience, read those letters carefully.
The bottom line
Your gums are not a cosmetic concern. They are a living, bleeding, inflammation-sensitive readout of how your body is handling sugar, stress, and time. A competent periodontal exam can, and often does, flag metabolic disease months to years before a routine check-up. That is not a replacement for your physician and your lab work — it is a parallel early-warning system, and in a country with the diabetes burden that ours carries, it is one we should be using.
If it has been more than a year since your last full periodontal exam, book one. And do not forget to bring your most recent HbA1c with you.