Periodontitis is a serious gum infection that damages the soft tissue around the teeth and, if left untreated, destroys the bone that holds them in place, eventually leading to loose teeth and tooth loss. It affects roughly 42 percent of American adults over 30, yet its early stages are often painless and easy to miss. Periodontitis matters beyond the mouth, too: research increasingly links it to conditions such as diabetes and heart disease through the body-wide inflammation it drives. The encouraging news is that it is largely preventable and, when caught early, very treatable. This guide explains what periodontitis is, its symptoms, causes, how it is diagnosed and staged, treatments, its connection to overall health, and the latest research.
What is periodontitis?
Periodontitis is advanced gum disease. It begins when plaque, a sticky film of bacteria, builds up on the teeth and, if not removed, hardens into tartar that extends below the gumline. This triggers chronic inflammation that gradually separates the gums from the teeth, forming deep pockets that trap more bacteria. Over time the infection destroys the connective tissue and bone that support the teeth.
Periodontitis usually develops from untreated gingivitis, the earliest and reversible stage of gum disease. It is common, affecting more than 4 in 10 US adults over 30, and its frequency rises sharply with age and is much higher in people who smoke or have diabetes. While the tissue and bone loss of periodontitis cannot be fully reversed, the disease can be stopped and controlled with proper treatment and ongoing care.
Symptoms of periodontitis
Because early periodontitis is often painless, many people do not realize they have it until it is more advanced. Warning signs include gums that are red, swollen, or tender, gums that bleed easily when brushing or flossing, and persistent bad breath or a bad taste. As it progresses, the gums may recede and make teeth look longer, and pus can appear between the teeth and gums.
In more advanced disease, teeth can feel loose or shift position, chewing may become painful, and the bite can change. Bleeding gums are one of the most common early clues, and they are a reason to see a dentist rather than something to ignore. Catching periodontitis early makes treatment simpler and helps prevent tooth loss, whereas its precursor, the reversible gum inflammation of gingivitis, is the ideal stage to intervene.
What causes periodontitis and its risk factors
The root cause of periodontitis is bacterial plaque that is not adequately removed and hardens into tartar, driving an ongoing immune reaction that damages the gums and bone. Poor oral hygiene sets the stage, but several factors greatly increase risk. Smoking and tobacco use are among the strongest, and vaping is a growing concern, while diabetes both raises the risk of periodontitis and is worsened by it.
Other contributors include genetics, hormonal changes such as those in pregnancy, certain medications that reduce saliva or affect the gums, and conditions that weaken the immune system. Age is a factor as well, with periodontitis far more common in older adults. Because it is closely tied to blood sugar, managing conditions like the elevated blood sugar of diabetes is an important part of protecting the gums.
How periodontitis is diagnosed and staged
A dentist diagnoses periodontitis through a clinical exam and measurements rather than a blood test. Using a small calibrated probe, they measure the depth of the pockets between the gums and teeth; depths of 1 to 3 millimeters are healthy, while deeper pockets suggest periodontitis. Dental X-rays reveal how much of the supporting bone has been lost, and the exam also notes bleeding, gum recession, and any loose teeth.
Since 2017, dentists classify periodontitis by stage and grade. The stage, from I to IV, reflects how severe and extensive the damage is, while the grade, from A to C, reflects how quickly it is progressing and factors in risks such as smoking and diabetes.
| Stage | What it reflects |
|---|---|
| Stage I | Early periodontitis with the initial loss of gum attachment and bone |
| Stage II | Moderate periodontitis with more attachment and bone loss |
| Stage III | Severe disease with deep pockets and the potential for tooth loss |
| Stage IV | Advanced disease with extensive bone loss, tooth loss, and bite problems |
Doctors and researchers are also interested in markers of body-wide inflammation, such as C-reactive protein, in the context of periodontitis, though these blood tests are not part of the standard dental diagnosis. Understanding the inflammation measured by a CRP test helps explain the growing interest in the link between gum health and the rest of the body.
Treatment options for periodontitis
The goal of treatment is to control the infection, halt bone and tissue loss, and keep the teeth. The cornerstone is a professional deep cleaning called scaling and root planing, which removes plaque and tartar from below the gumline and smooths the tooth roots so the gums can reattach. Antibiotics, either applied locally or taken by mouth, are sometimes added.
| Approach | Role |
|---|---|
| Scaling and root planing | The first-line deep cleaning that removes tartar below the gumline |
| Antibiotics | Local or oral medicines that help control bacterial infection |
| Surgery | Flap surgery, bone grafts, or tissue regeneration for advanced disease |
| Maintenance care | Regular professional cleanings and good home care to prevent relapse |
For advanced periodontitis, surgical options can reduce pocket depth, regenerate lost bone or tissue, or graft gum tissue. After treatment, lifelong maintenance is essential: regular professional cleanings, thorough daily brushing and flossing, and controlling risk factors such as smoking and blood sugar keep the disease from returning. Quitting smoking, in particular, significantly improves treatment success.
Periodontitis and whole-body health
Periodontitis is increasingly understood as more than a dental problem, because the chronic inflammation and bacteria it produces can affect the rest of the body. The best-established link is with type 2 diabetes, and it runs in both directions: poorly controlled blood sugar worsens gum disease, and gum inflammation can make blood sugar harder to control, so treating one often helps the other.
Periodontitis is also associated with a higher risk of cardiovascular disease, likely through systemic inflammation, and researchers are studying connections to rheumatoid arthritis, adverse pregnancy outcomes, respiratory disease, and even Alzheimer’s disease. Tracking inflammation with markers like C-reactive protein, as explored in this look at how CBC and hs-CRP reveal hidden low-grade inflammation, is part of understanding these links, and the research on the gum bacterium behind some of them connects to conditions such as the memory loss of Alzheimer’s disease.
Latest scientific advances in periodontitis research
Recent research has clarified what works in treatment and deepened the understanding of periodontitis as a whole-body issue. According to PubMed-indexed research, a 2024 Cochrane review found that adding antimicrobial light-based photodynamic therapy to standard deep cleaning provided only very-low-certainty, clinically unimportant benefit over scaling and root planing alone (Jervøe-Storm et al., 2024). What this means for you: professional deep cleaning remains the proven backbone of periodontitis treatment, and you should not expect meaningful added benefit from light or laser add-ons based on current evidence.
A 2026 systematic review in the International Dental Journal described how a key gum bacterium releases tiny particles that can cross the blood-brain barrier and travel through the body, offering a biological explanation for links between periodontitis and Alzheimer’s disease, heart disease, and diabetes (Li et al., 2026). What this means for you: it helps explain why gum health may affect the brain and heart, though it does not prove that treating gum disease prevents those conditions. A 2026 review in the Journal of Clinical Medicine found that metabolic problems raise the risk of periodontitis, and that treating gum disease modestly lowers blood sugar and inflammation markers (Gherbon et al., 2026). What this means for you: caring for your gums and your metabolic health together may benefit both, supporting closer coordination between dental and medical care.
Glossary of key periodontitis terms
| Term | Definition |
|---|---|
| Plaque | A sticky film of bacteria that forms on teeth and drives gum disease. |
| Tartar | Hardened plaque that forms above and below the gumline. |
| Gingivitis | The earliest, reversible stage of gum disease, before bone loss. |
| Periodontal pocket | A deepened space between gum and tooth where bacteria collect. |
| Scaling and root planing | A deep cleaning that removes tartar below the gumline. |
| Attachment loss | The breakdown of the tissue and bone that anchor a tooth. |
| Staging and grading | The system used to describe how severe and fast-moving periodontitis is. |
Frequently asked questions about periodontitis
What causes periodontitis?
Periodontitis is caused by bacterial plaque that is not removed and hardens into tartar, triggering chronic inflammation that damages the gums and the bone supporting the teeth. It usually develops from untreated gingivitis, and risk is increased by smoking, diabetes, poor oral hygiene, genetics, and other factors.
What are the signs and symptoms of periodontitis?
Common signs include red, swollen, or bleeding gums, persistent bad breath, receding gums, loose or shifting teeth, pus at the gumline, and pain when chewing. Early periodontitis is often painless, so bleeding gums or gum changes are important reasons to see a dentist.
Is periodontitis curable, or can it only be managed?
The bone and tissue already lost to periodontitis cannot be fully regrown, so the disease is controlled rather than cured. With deep cleaning, good home care, and management of risk factors, the infection can be stopped and the teeth preserved, but ongoing maintenance is essential.
How do dentists treat periodontitis?
The first-line treatment is scaling and root planing, a professional deep cleaning that removes tartar below the gumline, sometimes combined with antibiotics. Advanced cases may need surgery to reduce pockets or regenerate bone and tissue, followed by regular maintenance cleanings.
What is the difference between gingivitis and periodontitis?
Gingivitis is the early, reversible stage of gum disease, with inflamed, bleeding gums but no bone loss. Periodontitis is the advanced stage, in which the infection destroys the supporting bone and tissue and can lead to tooth loss. Treating gingivitis prevents progression to periodontitis.
Can untreated periodontitis affect your overall health?
Yes. Periodontitis is associated with a higher risk of conditions such as type 2 diabetes and cardiovascular disease, likely through chronic inflammation, and research is exploring links to other conditions. Its relationship with diabetes in particular runs both ways, so gum health is part of overall health.
Sources
- Centers for Disease Control and Prevention — Gum (Periodontal) Disease — CDC, 2024 — cdc.gov
- National Institute of Dental and Craniofacial Research — Periodontal (Gum) Disease — NIDCR, 2024 — nidcr.nih.gov
- Mayo Clinic Staff — Periodontitis: Diagnosis and Treatment — Mayo Clinic, 2023 — mayoclinic.org
- Jervøe-Storm P-M, Bunke J, Worthington HV, et al. — Adjunctive antimicrobial photodynamic therapy for treating periodontal and peri-implant diseases — Cochrane Database of Systematic Reviews, 2024 — doi.org/10.1002/14651858.CD011778.pub2
- Li Z, Luo C, Wen P, et al. — Porphyromonas gingivalis Outer Membrane Vesicles From Pathogenesis to Therapeutic Implications — International Dental Journal, 2026 — doi.org/10.1016/j.identj.2026.109548
- Gherbon A-M-C, Frandes M, Roman D, et al. — Metabolic Syndrome and Periodontitis: From Shared Mechanisms to Interdisciplinary Care — Journal of Clinical Medicine, 2026 — doi.org/10.3390/jcm15145510
Further reading
- Catch gum disease at its reversible stage by reading this guide to the early inflammation of gingivitis.
- Understand the condition most closely tied to gum disease in this guide to the blood sugar problems of diabetes.
- See how low-grade inflammation is tracked in this look at CBC and hs-CRP inflammation markers.
- Explore a condition researchers are linking to gum bacteria in this guide to the memory loss of Alzheimer’s disease.
- Build confidence reading test results with this guide to reference ranges, flags, and next steps on a lab report.
Understand your lab results with BloodSense
Periodontitis is diagnosed in the dental chair, but its ripple effects show up in blood work, from the C-reactive protein that reflects body-wide inflammation to the blood sugar markers tied to diabetes. Seeing how these values sit against their reference ranges helps connect gum health to the bigger picture of your wellbeing. BloodSense translates a full lab report into plain language, showing what each marker means and helping you track changes over time instead of reading one line in isolation.
