Gum disease is one of the most common conditions in dentistry, and one of the easiest to underestimate — because in its early stage, it rarely hurts. Most people who have it don't know it yet, which is exactly why it does so much damage before anyone notices.
Below, our Sudbury team walks through what gum disease actually is, how to catch it early, and what treatment looks like depending on how far it's progressed.
1 What Is Gum Disease?
Gum disease — also called periodontal disease — is an infection of the tissues that surround and support your teeth: the gums, the ligaments, and the bone underneath. It starts with plaque, the sticky film of bacteria that constantly forms on teeth. Left in place along the gumline, that plaque irritates the gum tissue, and the body's inflammatory response to it is what causes the redness, swelling, and bleeding most people associate with gum problems.
What makes gum disease particularly worth understanding is that it isn't one condition — it's a spectrum, and where you fall on that spectrum determines whether the damage can still be reversed.
2 The Two Stages: Gingivitis vs. Periodontitis
Gum disease is generally described in two stages, and the line between them matters more than almost anything else in this guide.
✅ Gingivitis — Reversible
- Gums are red, swollen, and bleed easily
- No bone or ligament damage yet
- Fully reversible with a professional cleaning and better home care
- The stage almost everyone experiences at some point
⚠️ Periodontitis — Not Reversible
- Plaque has hardened into tartar below the gumline
- Bone and connective tissue supporting teeth begin breaking down
- Damage can be managed but not undone
- Advanced cases can lead to loose or lost teeth
The key takeaway: catching gum disease at the gingivitis stage means a full recovery is realistic. Once it progresses to periodontitis, treatment shifts from "reverse it" to "stop it from getting worse" — which is exactly why early detection matters so much.
3 How Common Is Gum Disease?
It's far more common than most people assume. Large-scale U.S. health survey data has found that roughly 47% of adults aged 30 and older have some form of periodontal disease, a figure that rises to around 70% among adults 65 and older. Of that group, severity breaks down roughly into mild, moderate, and severe cases, with severe periodontitis — the stage most likely to threaten tooth loss — affecting a meaningful minority of adults.
These numbers matter for one reason: if you assume gum disease is rare or only happens to people who neglect their teeth entirely, you're less likely to take the early signs seriously. In reality, it's common enough that regular checkups exist specifically to catch it before you'd notice anything yourself.
4 Early Warning Signs
The earliest signs of gum disease are subtle enough that people often dismiss them as normal.
Bleeding when you brush or floss
The single most common early sign — and the one most often brushed off as "just sensitive gums."
Red or puffy gums
Healthy gums are firm and pale pink; inflamed gums look swollen and darker.
Persistent bad breath
Bacteria below the gumline produce odour that brushing alone doesn't fully clear.
Gums that look like they're "pulling back"
Recession that exposes more of the tooth root than before.
A tooth that feels slightly loose
Usually a later sign, and one that should never be ignored.
Changes in your bite
Teeth feeling like they fit together differently than they used to.
If any of these sound familiar, the right move isn't to wait and see if it gets worse — it's to get a proper exam, since pocket depth (how far the gum has detached from the tooth) can only be measured with a dental instrument, not by looking in a mirror.
5 What Causes Gum Disease?
At its root, gum disease is caused by plaque that isn't removed consistently enough. When plaque stays on the teeth and along the gumline, it hardens into tartar within about 24 to 72 hours — and tartar can no longer be removed by brushing or flossing at all, only by professional instruments. That trapped tartar becomes a permanent irritant to the gum tissue next to it, which is why gum disease tends to progress steadily once tartar has built up rather than staying static.
"Patients are often surprised that gum disease isn't really about how hard you brush — it's about consistency. Missing the same spots every day, even lightly, is what lets tartar build up along the gumline where a toothbrush alone can't reach it anymore."
Dr. Derek Lewis, DDS — Long Lake Family Dentistry6 Risk Factors That Raise Your Odds
Plaque buildup is the direct cause, but several factors make someone more likely to develop gum disease even with reasonable home care:
Smoking & Vaping
One of the strongest risk factors — it also masks bleeding, an early symptom, making it harder to catch.
Diabetes
Higher blood sugar makes gum tissue more prone to infection, and the relationship runs both ways.
Genetics
Some people are more susceptible to periodontal disease regardless of how well they brush and floss.
Certain Medications
Some prescriptions reduce saliva flow (dry mouth), which removes a natural defence against plaque bacteria.
Hormonal Changes
Pregnancy and other hormonal shifts can temporarily increase gum sensitivity to plaque.
Crowded or Crooked Teeth
Harder to clean thoroughly, which means plaque accumulates in spots a straight smile wouldn't trap it.
None of these guarantee gum disease will develop, and none of them make it inevitable if you already have one or two — they're simply reasons some patients need closer monitoring than others.
7 How Gum Disease Is Diagnosed
Diagnosis isn't guesswork — it's a measured exam. A dental hygienist or dentist uses a small probe to measure the depth of the space between each tooth and its surrounding gum, called the periodontal pocket. Healthy pockets typically measure 1 to 3 millimetres; anything deeper is a sign the attachment between gum and tooth has broken down to some degree.
X-rays add the piece a probe can't see: the bone level beneath the gumline. Comparing bone height over successive visits is one of the most reliable ways to tell whether gum disease is stable, improving, or progressing.
This is also why gum disease is difficult to accurately self-diagnose — bleeding tells you something is wrong, but only pocket measurements and X-rays tell you how far it has progressed and what stage of treatment is appropriate.
8 Treatment Options by Stage
- ✓ Gingivitis: a professional cleaning to remove existing plaque and tartar, combined with improved daily brushing and flossing, is often enough to fully reverse it within a matter of weeks.
- ✓ Mild to moderate periodontitis: typically treated with scaling and root planing — a deeper cleaning that removes tartar and smooths root surfaces below the gumline, making it harder for bacteria to reattach.
- ✓ Advanced periodontitis: may require more frequent maintenance cleanings, and in some cases referral to a periodontist (a gum specialist) for procedures aimed at reducing pocket depth or regenerating lost bone and tissue.
Whatever the stage, treatment doesn't stop at one appointment — ongoing maintenance cleanings, often more frequent than the standard six-month schedule, are what keep periodontitis from continuing to progress after the initial treatment.
9 The Body-Wide Connection
Gum disease doesn't stay contained to the mouth. Chronic inflammation from periodontal disease has been studied in connection with several systemic health conditions — most notably cardiovascular disease and blood sugar control in people with diabetes, where the relationship appears to run in both directions: uncontrolled diabetes raises gum disease risk, and untreated gum disease can make blood sugar harder to manage.
These connections are part of why we ask about your general medical history, not just your teeth, at every checkup — gum health is a genuine piece of your overall health picture, not a separate concern.
10 Quick Checklist: When to See a Dentist
Book a checkup sooner rather than waiting for your next scheduled visit if you notice:
- ✓ Gums that bleed regularly when brushing or flossing
- ✓ Gums that look swollen, red, or feel tender
- ✓ Bad breath that doesn't improve with brushing
- ✓ Any tooth that feels loose or shifted
- ✓ Gums that appear to be receding or pulling away from a tooth
Sudden, severe gum pain with swelling or pus is not something to wait out — that can indicate an active infection needing prompt care.
See Emergency Care →Regular six-month checkups remain the best defence — most gum disease is caught and treated at the gingivitis stage precisely because it's found before symptoms become obvious.
