Periodontitis: symptoms, stages, causes and treatment (the complete guide)
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Key takeaways in one minute
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Most people discover periodontitis in a dental chair, as a word on a check-up report, long after the disease quietly started. There was no toothache, nothing dramatic: just a little pink in the sink after brushing, perhaps a gum line that seemed to creep upwards, a gap between two teeth that had not been there before.
That silence is exactly why periodontitis matters. It is one of the most common chronic diseases in the world and the main reason adults lose teeth, yet it is easy to detect and, in most cases, to bring under control. Keeping your teeth often comes down to how early you notice.
This guide covers definition, symptoms, causes, stages, diagnosis, treatment and prevention, with links to dedicated articles if you want to go further.
What is periodontitis?
Periodontitis is a chronic inflammatory disease of the periodontium, the set of tissues that anchor each tooth in the jaw. It develops when the bacterial biofilm along the gum line becomes unbalanced and the body's inflammatory response gets out of hand, gradually destroying the tooth's attachment and the bone around it.
The periodontium has four parts: the gum (gingiva), the periodontal ligament (fibres linking the root to the bone), the cementum covering the root, and the alveolar bone. In a healthy mouth, the gum fits snugly around each tooth like a collar, leaving a shallow groove called the gingival sulcus. In periodontitis, this collar comes away, the bone is resorbed and the tooth loses its support.
You will also see the broader terms "periodontal disease" and "gum disease", which cover both gingivitis and periodontitis.
An ecosystem out of balance, not a simple infection
Think of your mouth as a garden rather than an operating theatre. Hundreds of bacterial species live there, most of them harmless or useful, and dental plaque is their organised community: a biofilm that rebuilds itself on the teeth every day.
Trouble starts when this biofilm matures along the gum line and slips underneath it. More aggressive species take over (a shift known as dysbiosis) and the immune system reacts strongly. The immunologist George Hajishengallis summarises it this way: periodontitis is a dysbiotic inflammatory disease with an adverse impact on systemic health. In other words, bone is lost mainly because the inflammation spirals, not just because of the bacteria.
This is why the goal of daily care is not to sterilise the mouth, but to disturb the biofilm regularly where it causes harm, an idea we explore in A new paradigm in oral health.
How common is periodontitis?
Periodontitis is among the most widespread chronic conditions on the planet. According to the WHO oral health fact sheet, severe periodontal diseases are estimated to account for more than 1 billion cases worldwide, with poor oral hygiene and tobacco use as the main risk factors.
A global review published in 2014 in the Journal of Dental Research put the age-standardised prevalence of severe periodontitis at 11.2%, making it the sixth most prevalent condition in the world. Counting all stages, the European Federation of Periodontology estimates that around 40% of people have periodontitis, and that around 70% of tooth loss in adults is caused by it.
These numbers are not contradictory: one counts severe forms only, the other all stages of the disease.
Gingivitis vs periodontitis: what is the difference?
Gingivitis is inflammation of the gum alone and is fully reversible; periodontitis is the next step, when inflammation reaches the attachment and the bone. Not every case of gingivitis becomes periodontitis, but every case of periodontitis starts as gingivitis.
| Gingivitis | Periodontitis | |
|---|---|---|
| Tissues affected | Gum only | Gum, ligament, cementum and bone |
| Typical signs | Red, swollen gums that bleed | Same signs, plus pockets, recession, loose teeth |
| Bone loss | No | Yes, visible on X-rays |
| Reversible? | Yes, with good daily hygiene | Can be stabilised, but lost bone does not grow back on its own |
| Care needed | Better hygiene, professional cleaning | Step-by-step periodontal treatment and lifelong maintenance |
Susceptibility, smoking and diabetes decide whether gingivitis tips over into periodontitis.
What are the symptoms of periodontitis?
The early symptoms of periodontitis are subtle: gums that bleed when you brush or floss, redness, swelling and bad breath. Later signs reflect bone loss that has already happened: receding gums, teeth that drift apart or become loose, and sometimes pus. Pain is rare, which is why the disease is so often found late.
| When it appears | Symptoms | What it means |
|---|---|---|
| Early | Bleeding when brushing or flossing, red and puffy gums | Active gum inflammation |
| Early | Persistent bad breath or a bad taste | Biofilm building up under the gum |
| Intermediate | Receding gums, teeth that look longer, sensitivity to cold | Loss of attachment, exposed root |
| Intermediate | New gaps between teeth, food getting stuck | Teeth drifting as bone is lost |
| Late | Loose tooth, a tooth that feels "high" when you bite | Significant bone loss |
| Late | Pus at the gum line, abscess, painful swelling | Infection in a deep pocket |
Bleeding is the most important signal, and the most often ignored: healthy gums do not bleed, even when you floss. Dentists rely on the same clue: in a classic study published in 1986, sites that bled on probing at all four check-ups had a 30% chance of losing attachment, against 1.5% for sites that never bled. No bleeding is one of the best signs of stability.
When the gum line moves down and the roots start to show, this is called gum recession. We explain why it happens and how to stop it in receding gums: causes and how to stop gum recession. And if a tooth has started to move, our article on a loose tooth in adults: causes and what to do helps you judge how urgent it is.
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When to see a dentist without delay
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What causes periodontitis?
The root cause of periodontitis is dental biofilm accumulating along and under the gum line. Biofilm alone is not enough, though: risk factors such as smoking, diabetes, genetics and stress decide whether the inflammation stays superficial or goes on to destroy bone. That is why two people with similar brushing habits can follow very different paths.
| Factor | What the evidence says | What you can do |
|---|---|---|
| Biofilm (plaque) | The essential starting point of the disease | Brush twice a day and clean between your teeth daily |
| Smoking | Increases the risk of periodontitis by 85% (2018 meta-analysis) | Stop smoking: it is the most powerful lever |
| Diabetes | A major modifying factor, in a two-way relationship | Keep blood sugar under control, tell your dentist |
| Genetics | Up to a third of the variation between people is genetic | Early screening if periodontitis runs in the family |
| Stress | Associated with the disease in many studies, causal link not proven | Look after your overall health, keep regular check-ups |
| Pregnancy | Hormones make gums more prone to inflammation | Have a dental check-up during pregnancy |
Smoking is also deceptive: it reduces gum bleeding and so hides the main warning sign.
On genetics, a 2019 systematic review concluded that up to a third of the variance of periodontitis in the population is genetic, more so for severe disease. Inheriting a susceptibility is not inheriting the disease. Contagion, heredity and other risk factors are covered in is periodontitis contagious or hereditary? The risk factors.
What are the stages of periodontitis?
Since the 2017 World Workshop classification, periodontitis is described by a stage and a grade. The stage (I to IV) reflects how severe the disease is and how complex it will be to treat; the grade (A to C) estimates how fast it is progressing and how likely it is to get worse.
This framework, agreed by the American and European periodontal societies, replaced the older labels "chronic" and "aggressive" periodontitis. Your notes might therefore read "periodontitis, stage III, grade B".
The four stages of periodontitis
| Stage | What it means | What the clinician sees |
|---|---|---|
| Stage I: initial | Attachment loss has just begun | Mild attachment loss, shallow pockets, no tooth lost to the disease |
| Stage II: moderate | Established but limited damage | Bone loss visible on X-rays, confined to the upper part of the root |
| Stage III: severe | Major destruction, some teeth at risk | Deep pockets, bone defects, sometimes teeth already lost |
| Stage IV: advanced | The whole dentition is at risk | Loose or drifting teeth, chewing problems, complex rehabilitation |
The stage does not go back down after treatment: a treated stage III remains a stable stage III, a reminder that follow-up has to continue.
The three grades: how fast it progresses
| Grade | Rate of progression | Typical clues |
|---|---|---|
| Grade A | Slow | Little destruction despite plaque, no risk factors |
| Grade B | Moderate | Damage in line with the amount of plaque; the default grade |
| Grade C | Rapid | More destruction than the plaque would explain, often heavy smoking or poorly controlled diabetes |
The grade is based on the progression seen on previous X-rays or examinations, adjusted for risk factors. It tells your dental team how often they need to see you.
How is periodontitis diagnosed?
Periodontitis is diagnosed with periodontal probing and X-rays. The dentist or periodontist measures, in millimetres, the depth of the space around each tooth, records bleeding, recession and mobility, then checks the bone level.
A periodontal pocket is the abnormal space that forms between the gum and the root when the attachment is destroyed. To measure it, the clinician gently slides a thin graduated probe at several points around every tooth. Together, these measurements make up the periodontal chart, a map of your mouth.
Pocket depth matters for the future of each tooth. Normal depths, and whether a pocket can close, are explained in periodontal pockets: normal depth and can they close?.
X-rays show the bone level around the roots. Your dental team will also ask about smoking, diabetes, medication and family history before setting your stage and grade.
Can periodontitis be cured?
Periodontitis cannot be cured in the sense of returning to the original state: bone that has been lost does not grow back on its own. It can, however, be stopped and kept stable for the long term, with gums that no longer bleed and pockets that close.
The Swiss dentists' association SSO says the same on its patient page on bleeding gums: with systematic treatment, existing periodontitis can usually be brought to a standstill. The 2017 classification even has a name for this result: periodontal health on a reduced periodontium. The tissues are lower than before, but healthy and stable, much like a garden replanted after a storm.
The figures are encouraging. A systematic review carried out for the European guideline found that after subgingival instrumentation, pocket depth fell by 1.4 mm on average at 6 to 8 months, and 74% of pockets closed. Over the long term, a study that followed adults through 30 years of regular maintenance recorded only 0.4 to 1.8 teeth lost per person, depending on the age group.
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The key point Periodontitis is stabilised, not cured once and for all. Treated gums remain sensitive ground: they need a routine adapted to them and regular maintenance visits, at intervals set according to your own risk profile. |
How is periodontitis treated? The four EFP steps
Treatment of periodontitis follows four steps set out by the European Federation of Periodontology in its 2020 clinical practice guideline: behaviour change and risk factor control, cleaning beneath the gum, treating sites that do not respond, and lifelong supportive care.
| Step | Goal | In practice |
|---|---|---|
| 1. Biofilm and risk factor control | Change daily habits | Brushing and interdental cleaning coaching, scaling above the gum, help to stop smoking, diabetes control |
| 2. Subgingival instrumentation | Remove biofilm and tartar below the gum | Deep cleaning (scaling and root planing), often under local anaesthetic |
| 3. Treating non-responding sites | Reach the deep pockets that remain | Repeat instrumentation or surgery (access or regenerative) |
| 4. Supportive periodontal care | Prevent recurrence | Visits every 3 to 12 months depending on your risk |
Step 2, often called a deep cleaning, is the heart of non-surgical treatment. We describe how it is done, how much it hurts and what recovery looks like in scaling and root planing: procedure, pain and recovery.
Many "natural remedies" claim to cure periodontitis; none replaces professional treatment, and some damage gums or enamel. Sort them out in natural remedies for periodontitis: what helps and what harms.
Is periodontal treatment covered by health insurance?
Coverage varies widely from one country to another. In Switzerland, according to the Federal Office of Public Health, basic health insurance pays for dental treatment only when it is linked to a severe, unavoidable disease of the masticatory system or to a serious general illness. In Germany, statutory health insurance covers a structured pathway defined in a federal periodontitis directive. Wherever you live, ask for a written treatment plan and cost estimate.
How does periodontitis affect the rest of the body?
Left untreated, periodontitis leads to the gradual loss of teeth. It is also associated with general diseases, especially diabetes and cardiovascular disease, although cause and effect are not always proven.
For your teeth and implants
As bone is destroyed, teeth loosen until they are lost. A history of periodontitis also matters for implants, because the same dysbiosis can develop around them and cause peri-implantitis, covered in peri-implantitis: symptoms, causes, treatment and prevention.
For your general health
With diabetes, the relationship runs both ways. A 2022 Cochrane review found, with moderate-certainty evidence, that treating periodontitis in people with diabetes led to an absolute reduction in HbA1c of 0.43% three to four months after treatment.
For the heart, a 2020 consensus report from the EFP and the World Heart Federation confirmed significant associations between periodontitis and cardiovascular disease. Other links, with pregnancy or dementia for example, are being studied with varying levels of evidence. We review the figures and their limits in periodontitis and general health: diabetes, heart, pregnancy and dementia.
How can you prevent periodontitis?
Preventing periodontitis means controlling the biofilm every day without harming the gum: gentle brushing twice a day for at least two minutes with a fluoride toothpaste, daily cleaning between the teeth, and regular check-ups with your dental team.
These are the EFP's patient recommendations, which also advise cleaning between the teeth before brushing, using floss only where gaps are too small for interdental brushes. Switzerland's SSO adds that interdental brushes clean best and are easier to handle than floss.
- Brushing: a 2014 Cochrane review found that, after three months, powered toothbrushes reduced plaque by 21% and gum inflammation by 11% more than manual brushes.
- Interdental cleaning: a toothbrush cannot reach between the teeth, where periodontitis often begins. Use an interdental brush sized for each gap.
- Gentleness: on fragile gums, heavy pressure or stiff bristles worsen recession. The right tool is soft and precise.
- Follow-up: after treatment, maintenance visits at the frequency your dental team sets.
The EFP's Gum Health Day, every year on 12 May, is a good reminder to book a gum check. For a realistic, step-by-step routine, see our guide to the ideal oral hygiene routine, morning and evening. And if you are choosing equipment, we have compared the criteria in the best electric toothbrush for preventing and combating periodontitis and gingivitis.
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The EDELWHITE approach EDELWHITE, the Swiss brand specialising in gum health, designs its tools to control biofilm without harming fragile gums. They complement, and never replace, treatment by your dentist or periodontist.
Explore the full range in our periodontal and gingivitis care collection. |
Frequently asked questions about periodontitis
Periodontitis, periodontosis or pyorrhoea: what is the difference?
Periodontitis is the correct medical term for chronic inflammation of the tissues that support the teeth. "Periodontosis" and "pyorrhoea" are older terms still heard in everyday language, but dentists today speak of periodontitis. "Periodontal disease" and "gum disease" are broader terms that include both gingivitis and periodontitis.
Is periodontitis contagious?
Periodontitis is not contagious in the way flu is. The bacteria associated with the disease can pass between family members or partners through saliva, but carrying these bacteria is not enough to trigger periodontitis. Whether the disease develops depends on hygiene, smoking, diabetes, genetics and immune response. If your partner is being treated, a gum check for you is sensible.
Is periodontitis painful?
Usually not. Periodontitis generally progresses painlessly for years, which is why it is often discovered late. The typical signs are bleeding gums, bad breath, receding gums or sensitivity to cold. Sharp pain, swelling or pus suggest a periodontal abscess, which needs a prompt visit to a dentist.
Will I lose my teeth if I have periodontitis?
Not necessarily. When periodontitis is diagnosed, treated and followed by regular maintenance, most people keep the vast majority of their teeth for decades. The risk rises mainly when deep pockets persist, when smoking continues or when follow-up visits stop.
Can periodontitis be treated at home without a dentist?
No. Careful hygiene at home is essential, but it cannot remove the tartar and biofilm lodged deep inside periodontal pockets. Only professional instrumentation below the gum can do that, and mouthwashes, herbs or oils do not replace it. Equally, without effective daily hygiene the results of treatment do not last.
Is periodontitis hereditary?
Partly. A 2019 systematic review estimated that up to a third of the variation in periodontitis risk between people is explained by genetics, more so for severe forms. You inherit a susceptibility, not the disease itself. If your parents lost teeth early because of their gums, tell your dentist and have regular gum checks.
At what age does periodontitis start?
Periodontitis can begin in adolescence or early adulthood, although it becomes more common with age. According to a 2014 global review in the Journal of Dental Research, new cases of severe periodontitis peak at around 38 years of age. Rapidly progressing forms (grade C) can affect young people, so repeated gum bleeding justifies a periodontal check at any age.
Can periodontitis come back after treatment?
Yes, because the underlying susceptibility remains. This is why the European Federation of Periodontology recommends supportive periodontal care after active treatment, at intervals of 3 to 12 months tailored to each patient's risk profile. Thorough daily hygiene, stopping smoking and good diabetes control all reduce the risk of recurrence.
What is the best toothbrush for periodontitis?
Choose a soft toothbrush that cleans the gum line effectively without damaging it. A 2014 Cochrane review found that powered toothbrushes reduce plaque and gum inflammation more than manual ones after three months. Look for very fine, soft filaments, a mode for sensitive gums and controlled pressure, and always add daily interdental cleaning.
Is periodontitis treatment covered by health insurance?
It depends on the country and on your insurance. In Switzerland, basic health insurance pays for dental care only in connection with severe, unavoidable diseases of the masticatory system or serious general illness, while Germany's statutory insurance covers a structured periodontal treatment pathway. Elsewhere, public schemes, private cover and out-of-pocket costs combine differently, so ask for a written cost estimate.
This article is for information only and does not replace the advice of a dentist or periodontist.