Periodontal Disease: Causes, Stages, Symptoms, Treatment and Prevention

Periodontal disease, commonly called gum disease, is an infection and inflammatory condition affecting the tissues that surround and support the teeth. It can begin with something as seemingly minor as bleeding gums and, if ignored, progress to destruction of the bone and tissues that hold teeth in place.

The good news is that periodontal disease is largely preventable and treatable. Gingivitis, the early form of gum disease, can generally be reversed. Once it progresses to periodontitis, however, the bone and attachment tissues that have already been lost cannot simply grow back. The disease can nevertheless be controlled, and appropriate treatment can help prevent further damage and tooth loss.

This guide explains the causes, symptoms, stages, treatment and long-term outlook of periodontal disease, including some of the questions people commonly ask after being diagnosed.

What is periodontal disease?

Periodontal disease affects the structures surrounding the teeth, collectively known as the periodontium. These include:

• Gums (gingiva)
• Periodontal ligament
• Cementum covering the tooth root
• Alveolar bone that supports the teeth

The disease generally begins when dental plaque, a sticky film containing bacteria, accumulates around the teeth and gumline. If plaque is not removed effectively, it can harden into tartar or calculus, which cannot be removed by ordinary brushing and flossing.

The bacteria and the body’s inflammatory response can cause the gums to become red, swollen and prone to bleeding. At this stage, the condition is called gingivitis.

If inflammation and infection continue, the gums can separate from the teeth, creating periodontal pockets. Bacteria can then accumulate deeper below the gumline and damage the periodontal ligament and supporting bone. This is periodontitis.

What is the main cause of periodontal disease?

The main cause is bacterial plaque buildup around and below the gumline.

Plaque forms naturally on teeth. The problem occurs when it is not removed regularly. Over time, plaque can become calculus, making it easier for more plaque and bacteria to accumulate.

However, periodontal disease is not simply a matter of “not brushing enough.” The severity and progression of disease are influenced by several other factors, including:

• Smoking and tobacco use
• Diabetes and poor blood sugar control
• Genetic susceptibility
• Poor oral hygiene
• Certain medications
• Hormonal changes
• Some conditions affecting the immune system
• Poor nutrition
• Dry mouth
• Stress and other lifestyle factors

Smoking is particularly important because it increases the risk of periodontal disease and can make treatment less successful.

Modern research also recognises that periodontitis involves an interaction between the oral microbiome and the body’s immune response. In other words, the bacteria matter, but the body’s inflammatory response to those bacteria also plays a major role in tissue destruction.

What are the symptoms of periodontal disease?

Periodontal disease can progress quietly. Some people have significant gum and bone damage before they experience obvious pain.

Common signs include:

• Bleeding while brushing or flossing
• Red, swollen or tender gums
• Persistent bad breath
• Bad taste in the mouth
• Gums pulling away from the teeth
• Teeth appearing longer because of gum recession
• Increased tooth sensitivity
• Pus around the gums
• Pain or discomfort while chewing
• Loose or shifting teeth
• New spaces developing between teeth
• Changes in the way your teeth meet when you bite

A particularly important warning sign is bleeding gums. Occasional bleeding should not simply be dismissed as normal.

What are the 5 stages of periodontal disease?

You may see periodontal disease described online in five stages: Stage 0 through Stage 4, like the accompanying graphic. This is a useful simplified way of explaining how gum problems can progress:

Stage 0: Healthy gums

At this stage, the gums are healthy and there is no evidence of periodontal disease.

Healthy gums generally fit snugly around the teeth and should not routinely bleed during brushing or flossing.

Stage 1: Gingivitis

Gingivitis is the earliest form of gum disease.

The gums may become:

• Red
• Swollen
• Tender
• Prone to bleeding

Importantly, gingivitis does not involve the bone loss characteristic of periodontitis. With appropriate professional cleaning and improved oral hygiene, gingivitis can generally be reversed.

Stage 2: Early periodontitis

Once periodontitis develops, the supporting structures around the teeth begin to be damaged.

There may be periodontal pockets and early bone loss. Symptoms can still be relatively mild, which is why dental examinations are important even when your mouth does not hurt.

Stage 3: Moderate periodontitis

Bone and attachment loss become more significant. Gum recession, deeper pockets, tooth sensitivity and changes in tooth position may become noticeable.

Without treatment, the teeth can gradually lose their support.

Stage 4: Severe periodontitis

This represents advanced periodontal destruction. Teeth may become noticeably loose or shift, chewing may become difficult and there can be substantial bone and attachment loss.

Important: The current professional classification does not technically describe periodontal disease as five stages. Modern periodontitis classification uses Stage I, II, III and IV, along with Grade A, B or C to describe severity, complexity and likely rate of progression. Gingivitis is classified separately.

So, if you are looking at a graphic showing Stage 0 to Stage 4, it is best understood as a patient-friendly progression chart, rather than the current formal periodontal classification.

Stages of Periodontal Disease

Periodontal disease progresses in four distinct stages:

1. Stage 0: Healthy Gums

At this stage, the gums are firm, pink, and do not bleed while brushing or flossing. Proper oral hygiene keeps the gums healthy and prevents disease development.

2. Stage 1: Gingivitis

• Gingivitis is the earliest stage of periodontal disease and is caused by plaque accumulation.
• Symptoms include redness, swelling, and bleeding of the gums.
• It is reversible with proper oral hygiene and professional dental cleanings.

3. Stage 2: Early Periodontitis

• If gingivitis is left untreated, it advances to early periodontitis.
• The infection spreads to the bone supporting the teeth, leading to minor bone loss.
• Symptoms include persistent bad breath, gum recession, and slight discomfort while chewing.

4. Stage 3: Moderate Periodontitis

• More severe damage occurs as the infection progresses.
• The gums start to pull away from the teeth, forming deep pockets where bacteria thrive.
• Increased bone loss and loose teeth may occur.

5. Stage 4: Severe Periodontitis

• The final stage involves significant bone loss, deep gum pockets, and tooth mobility.
• Without treatment, tooth loss is inevitable, and infection can spread to other areas of the body.

What does Stage 4 periodontitis look like?

Stage 4 periodontitis is the most advanced category in the current staging system.

A person with severe periodontitis may have:

• Significant gum recession
• Deep periodontal pockets
• Major bone loss around teeth
• Loose or drifting teeth
• Difficulty chewing
• Tooth mobility
• Changes in the bite
• Persistent bad breath
• Pus or recurrent gum infections
• Missing teeth resulting from periodontal disease

However, appearance alone cannot determine whether someone has Stage 4 periodontitis. A dentist or periodontist needs to assess gum attachment, pocket depths, tooth mobility, radiographic bone loss, tooth loss and other complexity factors.

Dental X-rays are particularly useful because they can show bone loss that cannot be seen simply by looking in the mouth.

What happens if I have periodontal disease?

What happens next depends largely on how advanced the disease is.

If you have gingivitis, professional cleaning and improved daily oral hygiene may reverse the inflammation.

If you have periodontitis, the infection and inflammation can cause progressive destruction of the tissues supporting the teeth. As support is lost, teeth can become mobile and may eventually need to be removed.

Periodontitis can also make chewing uncomfortable and affect quality of life. It has been associated with several systemic health conditions, including diabetes and cardiovascular disease, although an association does not automatically prove that periodontitis directly causes those conditions.

The important point is that a diagnosis of periodontitis does not mean you are destined to lose your teeth. Early diagnosis, professional treatment, excellent oral hygiene and control of risk factors can make a major difference.

Can periodontal disease be cured?

The answer depends on what you mean by “cured.”

Gingivitis can generally be reversed.

Established periodontitis is different. Once supporting bone and attachment have been destroyed, that damage is generally considered irreversible. However, periodontitis can be treated and controlled, and progression can often be slowed or stopped.

Think of it somewhat like managing a chronic condition: the goal is to eliminate or reduce active infection and inflammation, preserve the remaining supporting tissues and prevent further destruction.

With successful treatment and regular maintenance, many people can keep their natural teeth for many years.

Can a dentist fix periodontitis?

Yes, a dentist can diagnose and treat many cases of periodontitis. Depending on the severity, you may also be referred to a periodontist, a dentist specialising in gum disease.

Treatment may include:

Professional cleaning

Plaque and tartar are removed from the teeth. This is particularly important because hardened calculus cannot be effectively removed through normal brushing at home.

Scaling and root planing

This is commonly called deep cleaning. The dentist or dental professional removes plaque and calculus from above and below the gumline and smooths contaminated root surfaces. Local anaesthesia may be used to keep the procedure comfortable.

Medication

In selected situations, your dentist may recommend an antimicrobial mouth rinse, medication placed into periodontal pockets or systemic antibiotics. These are generally adjuncts to professional periodontal treatment, not substitutes for removing plaque and calculus.

Periodontal surgery

More advanced disease may require surgical treatment, such as flap surgery, pocket reduction procedures or regenerative approaches, depending on the individual case.

What kills periodontitis bacteria?

There isn’t a single mouthwash, tablet or home remedy that simply “kills periodontitis bacteria” and cures the disease.

The most important treatment is mechanical disruption and removal of the bacterial biofilm and calculus through daily oral hygiene and professional periodontal treatment.

Antimicrobial products can reduce certain bacteria. For example, chlorhexidine is an antiseptic that can reduce germs in the mouth and may be used for gum disease for limited periods when recommended by a dental professional. Long-term or inappropriate use can cause problems such as tooth staining.

Antibiotics may be appropriate for selected patients, but they should not be viewed as a replacement for periodontal cleaning.

How painful is periodontal treatment?

Many people worry about periodontal treatment because they imagine deep cleaning will be extremely painful.

In reality, pain varies from person to person and depends on the severity of the disease and the procedure being performed.

Scaling and root planing can involve some sensitivity or discomfort, particularly when cleaning deep periodontal pockets. Local anaesthesia can be used to numb the area during treatment.

After deep cleaning, mild gum tenderness, discomfort or tooth sensitivity may occur temporarily. The American Dental Association notes that discomfort can last for a day or two and sensitivity can sometimes continue for up to about a week.

More extensive periodontal surgery can involve a longer recovery period, but your dental professional will explain pain-control and aftercare measures beforehand.

If you are particularly anxious about dental procedures, tell your dentist before treatment. Pain management can be planned around your individual needs.

What age do most people get periodontitis?

There is no single age at which everyone develops periodontitis.

The risk generally increases with age. Periodontitis is predominantly an adult disease, although severe forms can occasionally occur in younger people.

The CDC reports that periodontitis becomes more common as people get older, with approximately 60% of adults aged 65 or older having some level of periodontitis in the U.S. data it cites.

However, age is only one factor. Smoking, diabetes, genetics, oral hygiene and other risk factors can influence when periodontal disease develops and how quickly it progresses.

Can I live a long life with periodontal disease?

Yes. A diagnosis of periodontal disease does not mean you will have a shortened life.

However, untreated periodontitis should not be ignored. It is a chronic inflammatory disease and has been associated with several systemic health conditions. Researchers continue to study these relationships, and associations do not necessarily establish direct cause and effect.

From an oral-health perspective, the biggest concern is progressive destruction of the tissues supporting your teeth.

The best approach is therefore straightforward: get the disease assessed, treat active periodontitis and maintain your gums over the long term.

Can I still kiss with periodontitis?

Yes, having periodontitis does not mean you cannot kiss your partner.

Periodontitis itself is not considered a straightforward contagious disease. However, bacteria associated with periodontal disease can be transferred through saliva. The American Academy of Periodontology therefore recommends avoiding saliva-sharing behaviours such as sharing toothbrushes or eating utensils with someone who has periodontal disease.

This does not mean that kissing automatically gives your partner periodontitis. Whether periodontal disease develops depends on many factors, including the person’s oral hygiene, immune response, genetics, smoking and other risk factors.

If both partners have persistent bleeding gums, bad breath or other signs of gum disease, both should consider having a dental examination.

How long will teeth last with periodontal disease?

There is no fixed number of years that a tooth will last after periodontal disease develops.

Some teeth with periodontal disease remain functional for many years when the condition is treated and maintained. Other teeth may deteriorate more rapidly if there is severe bone loss, high disease activity, smoking, poor oral hygiene or other risk factors.

The prognosis depends on factors such as:

• Amount of bone supporting the tooth
• Depth of periodontal pockets
• Tooth mobility
• Amount of gum and attachment loss
• Root shape and anatomy
• Smoking
• Diabetes and other medical conditions
• Oral hygiene
• Response to treatment
• Regularity of periodontal maintenance

Periodontitis is one of the leading causes of tooth loss, but having periodontitis does not automatically mean you will lose your teeth.

How is periodontal disease diagnosed?

A dental examination is needed to determine whether you have gingivitis or periodontitis and how advanced the disease is.

Your dentist may:

1. Examine the gums for redness, swelling and bleeding.
2. Look for plaque and tartar.
3. Measure periodontal pocket depths using a dental probe.
4. Check for gum recession and attachment loss.
5. Assess tooth mobility and changes in your bite.
6. Take dental X-rays to evaluate bone loss.
7. Review medical history and risk factors such as smoking and diabetes.

Healthy periodontal pockets are generally around 1–3 mm. Deeper pockets can indicate periodontal disease, although diagnosis involves more than pocket depth alone.

How can you prevent periodontal disease?

The best treatment for periodontal disease is prevention and early detection.

A good daily routine includes:

• Brush your teeth twice a day with fluoride toothpaste.
• Clean between your teeth every day using floss or interdental brushes.
• Have professional dental cleanings as recommended.
• Attend regular dental check-ups.
• Avoid smoking and tobacco products.
• Control diabetes and other medical conditions appropriately.
• Maintain a balanced diet.
• Do not ignore persistent bleeding or swollen gums.

Regular dental care is especially important if you already have periodontal disease because maintenance helps prevent the condition from becoming active again.

When should you see a dentist?

Make a dental appointment if you notice:

• Gums that bleed repeatedly
• Persistent bad breath
• Swollen or painful gums
• Gum recession
• Pus around your teeth
• Loose teeth
• Pain when chewing
• Increasing tooth sensitivity
• Teeth changing position or becoming separated

Loose teeth, significant swelling, pus or severe gum pain should not be ignored. Advanced periodontal disease can cause irreversible damage to the tissues supporting the teeth, but treatment is more effective when the disease is identified before substantial destruction occurs.

Frequently Asked Questions About Periodontal Disease

Is periodontal disease the same as gingivitis?

No. Gingivitis involves inflammation of the gums without the bone loss characteristic of periodontitis. Periodontitis involves destruction of the tissues supporting the teeth and is more advanced. Gingivitis can generally be reversed, while damage from established periodontitis cannot simply be reversed.

Can periodontal disease go away on its own?

It should not be expected to go away on its own. Improving oral hygiene can significantly help early gum inflammation, but established periodontitis requires professional assessment and treatment.

Does periodontal disease always cause tooth loss?

No. Untreated severe periodontitis can cause tooth loss, but many teeth can be preserved when periodontal disease is diagnosed and appropriately treated and maintained.

Can brushing cure periodontitis?

Brushing twice daily is essential for controlling plaque, but brushing alone cannot remove hardened tartar or reliably clean deep periodontal pockets. Professional treatment may therefore be necessary.

Is bleeding gums always a sign of periodontal disease?

Bleeding gums can be a sign of gingivitis or periodontitis, but bleeding can have other causes as well. Persistent or recurrent bleeding should be assessed by a dentist.

Does periodontal disease hurt?

It can, but periodontal disease is not always painful. This is one reason it can go unnoticed. Symptoms can include bleeding, swelling, bad breath, sensitivity, painful chewing and loose teeth.

Can periodontal bone loss grow back?

Bone that has been destroyed by periodontitis does not normally regenerate on its own. Certain periodontal procedures may be able to regenerate or reconstruct supporting tissues in appropriately selected cases, but results depend on the individual defect and overall condition.

Is periodontitis contagious?

Periodontitis itself is not considered simply contagious like a cold or flu. However, bacteria associated with periodontal disease can be transferred through saliva.

Can Stage 4 periodontitis be treated?

Yes. Even advanced periodontitis can be treated and managed. Treatment may involve deep cleaning, periodontal surgery, extraction of teeth with a poor prognosis and long-term maintenance. The exact plan depends on the amount of remaining bone and the condition of individual teeth.

Final takeaway

Periodontal disease is much more than a problem of bleeding gums. It can progress from gingivitis to periodontitis, gradually damaging the tissues and bone that keep your teeth firmly in place.

The encouraging news is that periodontal disease is preventable and treatable. Gingivitis can generally be reversed, while periodontitis can often be controlled with professional treatment and consistent oral care.

If your gums bleed regularly, your teeth feel loose, you have persistent bad breath or you have noticed gum recession, don’t wait for pain before seeking help. A dental examination, periodontal probing and, when appropriate, dental X-rays can identify the problem and determine how advanced it is.

Healthy gums are worth protecting—and early treatment can make a significant difference in keeping your natural teeth for the long term.

To consult a Dentist at Sparsh Diagnostic Centre for treatment of Periodontal Disease, call our helpline number 9830117733.

#BhaloTheko 

Medically Reviewed By

This article has been medically reviewed by Dr. Jaydeep Roy, BDS, Dental Surgeon at Sparsh Diagnostic Centre.

The content has been reviewed for medical accuracy, clinical relevance and clarity to ensure that the information about root canal treatment, its procedure, recovery, benefits and potential risks is consistent with current dental practice and patient-care guidance.

Medical Reviewer: Dr. Jaydeep Roy, BDS
Speciality: Dentistry
Medical Review Date: 3rd September 2026

This article is intended for general health information and educational purposes only. It should not be used as a substitute for professional dental advice, diagnosis or treatment.

Disclaimer:

No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.