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What Is Periodontology?

Periodontology is the branch of dentistry that deals with the structures supporting your teeth — the gums (gingiva), the bone underneath them (alveolar bone), the ligament connecting the tooth root to the bone (periodontal ligament), and the root surface coating (cementum). When these structures get infected, inflamed, or destroyed by bacterial disease, you’ve got periodontal disease — and it’s far more common and more consequential than most people realize.

The Quiet Epidemic

Gum disease is one of the most prevalent chronic conditions on Earth. The CDC estimates that 47.2% of American adults over 30 have some form of periodontitis. Among adults 65 and older, that number exceeds 70%. Globally, severe periodontitis affects roughly 1 billion people.

The kicker? Most people with periodontal disease don’t know they have it. Unlike a cavity — which eventually hurts — gum disease progresses silently. Your gums might bleed when you brush. They might look a little red. You might notice some bad breath. But there’s rarely sharp pain until the disease is advanced. By the time teeth start loosening, significant bone loss has already occurred.

How Gum Disease Develops

It starts with bacteria. Your mouth contains hundreds of bacterial species. Some are harmless; some form sticky biofilms on teeth called dental plaque. If plaque isn’t removed through brushing and flossing, it hardens into calculus (tarite) — a rough, mineralized deposit that can’t be removed with a toothbrush. Calculus provides a perfect surface for more bacteria to accumulate.

Stage 1: Gingivitis. Bacterial toxins irritate the gums, causing inflammation. Gums become red, swollen, and bleed easily. This stage is entirely reversible with proper brushing, flossing, and professional cleaning. No permanent damage has occurred.

Stage 2: Early periodontitis. If gingivitis goes untreated, the inflammation spreads below the gum line. Bacteria invade the space between the tooth and gum, forming pockets. The body’s immune response — combined with bacterial enzymes — begins destroying the periodontal ligament and alveolar bone. Early bone loss occurs.

Stage 3: Moderate periodontitis. Pockets deepen (6-7mm, versus the healthy 1-3mm). More bone is destroyed. Teeth may begin to loosen. Gum recession exposes root surfaces, causing sensitivity.

Stage 4: Advanced periodontitis. Severe bone loss. Deep pockets (8mm+). Teeth become mobile and may shift position. Abscesses form. Tooth loss is likely without aggressive treatment.

Risk Factors

Plaque bacteria are the primary cause, but several factors increase your risk:

Smoking is the strongest risk factor after bacteria. Smokers are 2-3 times more likely to develop periodontitis, and the disease progresses faster and responds less well to treatment. Smoking impairs blood flow to the gums and suppresses the immune response.

Diabetes and periodontitis have a bidirectional relationship. Diabetes increases susceptibility to infections including gum disease. Periodontitis, in turn, makes blood sugar control more difficult.

Genetics influence susceptibility. Some people develop severe periodontitis despite good oral hygiene, while others with mediocre habits maintain healthy gums. Genetic variations in immune response account for roughly 30% of the variation in disease severity.

Medications that reduce saliva flow (antidepressants, antihistamines, blood pressure medications) increase risk by removing saliva’s protective effects.

Hormonal changes during pregnancy, puberty, and menopause can increase gum sensitivity and susceptibility to gingivitis.

Treatment

Non-surgical treatment is the first approach. Scaling and root planing — a deep cleaning procedure performed under local anesthesia — removes plaque, calculus, and bacterial toxins from tooth roots and the insides of gum pockets. The smoothed root surfaces allow gums to reattach. This is often combined with antibiotic therapy (local or systemic).

Surgical treatment becomes necessary when pockets are too deep for non-surgical cleaning to reach. Procedures include:

• Flap surgery: The gums are lifted back, tartar is removed from deep pockets, and the gums are sutured to fit snugly around the teeth.
• Bone grafting: Lost bone is replaced with grafting material (from the patient, a donor, or synthetic material) to stimulate regrowth.
• Guided tissue regeneration: A membrane is placed between bone and gum tissue, allowing bone and connective tissue to regenerate.
• Soft tissue grafts: Tissue from the palate or a donor source is used to cover exposed roots or thicken thin gums.

Dental implants replace teeth lost to periodontal disease. A titanium post is surgically placed in the jawbone, osseointegrates (fuses with the bone) over 3-6 months, and then supports a crown. Success rates exceed 95%, but adequate bone must be present.

The Body Connection

Research over the past two decades has established links between periodontal disease and systemic health conditions. The mechanisms involve chronic inflammation (periodontitis increases inflammatory markers throughout the body) and direct bacterial invasion (oral bacteria have been found in atherosclerotic plaques, joint fluid, and brain tissue).

The evidence is strongest for cardiovascular disease — people with periodontitis have a 2-3 times higher risk of heart attack, stroke, and other cardiovascular events. The diabetes connection is well-established in both directions. Links to adverse pregnancy outcomes, rheumatoid arthritis, and respiratory disease are supported by growing evidence.

Prevention

The good news: periodontal disease is largely preventable.

Brush twice daily with fluoride toothpaste, spending at least two minutes per session. Electric toothbrushes are more effective than manual brushes for most people.

Floss daily. Brushing alone misses about 35% of tooth surfaces — the spaces between teeth where periodontal disease often starts.

Regular dental visits — professional cleanings and exams every 6 months (more frequently if you have risk factors) catch problems early when they’re still reversible.

Don’t smoke. Quitting reduces periodontal disease risk significantly within a year.

Your teeth are only as good as the foundations supporting them. A perfectly healthy tooth sitting in diseased bone and inflamed gums is a tooth you’re going to lose. Periodontology exists because keeping those foundations healthy is just as important as preventing cavities — and far too many people learn that lesson too late.

Frequently Asked Questions

What is the difference between gingivitis and periodontitis?

Gingivitis is inflammation of the gums — they're red, swollen, and bleed easily during brushing. It's reversible with proper oral hygiene. Periodontitis is the advanced stage where inflammation has damaged the bone and connective tissue supporting the teeth. Once bone is lost, it doesn't grow back without surgical intervention. Gingivitis can progress to periodontitis if untreated.

How common is gum disease?

Very common. The CDC reports that about 47% of American adults aged 30 and older have some form of periodontitis. That rises to over 70% for adults 65 and older. Gingivitis is even more prevalent — most adults experience it at some point. Globally, severe periodontitis affects roughly 19% of the adult population, making it one of the most common diseases in the world.

Can gum disease affect the rest of your body?

Yes. Research links periodontitis to increased risk of cardiovascular disease, type 2 diabetes complications, respiratory infections, adverse pregnancy outcomes, and possibly Alzheimer's disease. The connection appears to involve chronic inflammation and bacterial entry into the bloodstream. Treating periodontal disease may improve outcomes for these conditions.

Further Reading

• American Academy of Periodontology
• NIH - Periodontal Disease
• CDC - Periodontal Disease