Periodontitis (Advanced Gum Disease)

What Is Periodontitis?

The periodontium — the tooth-supporting apparatus — comprises four key structures: the gingiva (gums), the periodontal ligament, the cementum covering the root surface, and the alveolar bone that forms the tooth socket. In health, these tissues work together to hold each tooth firmly in place and withstand the forces of chewing. Periodontal disease disrupts this system by triggering chronic inflammation that gradually breaks down these supporting structures.

The condition begins when the balance of bacteria in dental plaque shifts from a healthy state to a dysbiotic one — meaning harmful bacteria begin to dominate. This microbial imbalance triggers an exaggerated immune-inflammatory response in susceptible individuals. Crucially, it is not the bacteria alone that cause the destruction; it is the body's own inflammatory response to those bacteria that breaks down the periodontal tissues.

Periodontitis follows a chronic, progressive course. Without intervention, the pockets between the teeth and gums deepen, bone is gradually resorbed, and teeth become increasingly mobile. The progression is not always steady — periods of active destruction can alternate with periods of relative stability — but the overall trajectory without treatment is one of cumulative tissue loss.

Early detection is essential because the damage caused by periodontitis cannot be fully reversed. The sooner treatment begins, the more supporting tissue can be preserved and the better the long-term outlook for keeping your natural teeth.

How Common Is Periodontitis in the UK?

Periodontitis is far more widespread than many people realise. Data from the 2023 Adult Oral Health Survey paints a striking picture of the scale of periodontal disease across the UK population.

• 93% of UK adults have at least one sign of periodontal disease, including bleeding gums, calculus, pocketing, furcation involvement, or tooth mobility
• 28% have pocket depths over 3.5mm, indicating established periodontal breakdown beyond simple gum inflammation
• 12% have pocket depths of 5.5mm or more, indicating moderate to severe gum disease requiring comprehensive periodontal assessment and treatment
• Only 52% of adults visit a dentist regularly, down from 61% in 2009 — meaning many cases of periodontitis go undetected until significant damage has occurred
• 40% cite difficulty finding an NHS dentist as a barrier to accessing care, contributing to delayed diagnosis and treatment

Prevalence increases with age and is higher among those living in areas of greater socioeconomic deprivation. These figures underscore the importance of routine periodontal screening at every dental visit — the earlier periodontitis is detected, the more effectively it can be managed and the more tooth-supporting tissue can be preserved.

Gingivitis vs Periodontitis: What's the Difference?

Understanding the distinction between gingivitis and periodontitis is important because it determines both the urgency and the type of treatment required.

Gingivitis always precedes periodontitis — it is the gateway condition. However, not all gingivitis progresses to periodontitis. With effective oral hygiene and professional cleaning, gingivitis can be completely resolved, preventing the irreversible damage that characterises periodontal disease.

The key clinical difference is clinical attachment loss. In gingivitis, the gum tissue is inflamed and may bleed, but the attachment between the tooth and the supporting bone remains intact. In periodontitis, this attachment breaks down, the periodontal pocket deepens, and bone resorption begins. Once this threshold is crossed, the goal of treatment shifts from reversal to stabilisation and long-term management.

Causes and Risk Factors for Periodontitis

Periodontitis develops when the bacterial composition of dental plaque shifts from a healthy balance to a dysbiotic state, and the body's immune-inflammatory response becomes dysregulated. This combination of microbial imbalance and excessive immune activation drives the destruction of periodontal tissues. Several factors increase the risk of this process taking hold.

• Smoking — the single most significant modifiable risk factor for periodontitis. Smoking impairs blood flow to the gums, suppresses the immune response, and significantly reduces the effectiveness of periodontal treatment. Smokers are two to six times more likely to develop severe disease
• Diabetes — the relationship is bidirectional. Poorly controlled diabetes increases the severity and progression of periodontitis, while active periodontal disease makes blood glucose levels harder to manage. Treating one condition benefits the other
• Genetic susceptibility — up to 30% of the population may carry genetic variations that increase their susceptibility to periodontitis, even with adequate oral hygiene
• Poor oral hygiene — inadequate brushing and interdental cleaning allows plaque to accumulate and mature into a pathogenic biofilm that drives the inflammatory process
• Medications causing dry mouth — reduced saliva flow removes a key protective mechanism, allowing bacteria to proliferate and plaque to accumulate more rapidly
• Hormonal changes — pregnancy, menopause, and hormonal fluctuations can alter the gum tissue's inflammatory response, increasing vulnerability to periodontal breakdown
• Stress — chronic stress affects the immune system's ability to respond appropriately to bacterial challenge, and may also lead to neglect of oral hygiene routines
• Poor nutrition — deficiencies in vitamin C and other micronutrients compromise the body's ability to maintain and repair connective tissues, including those of the periodontium
• Immune-compromising conditions — conditions such as HIV or treatments such as chemotherapy reduce the body's ability to control the bacterial challenge in dental plaque
• Age — prevalence and severity increase with age, reflecting the cumulative effect of long-term exposure to risk factors and the gradual changes in immune function

Signs and Symptoms of Advanced Gum Disease

Periodontitis is often called a “silent disease” because it can progress significantly before causing noticeable symptoms. Many patients are unaware they have advanced gum disease until substantial damage has already occurred. Recognising the following signs early can make a significant difference to treatment outcomes.

• Bleeding gums — gums that bleed when brushing, flossing, or eating are not normal, regardless of how common this experience may seem. Bleeding is a sign of active inflammation
• Red, swollen, or tender gums — healthy gum tissue is firm and pale pink. Redness, puffiness, or tenderness indicates an inflammatory response to bacterial plaque
• Persistent bad breath — chronic halitosis that does not improve with brushing can result from bacteria accumulating in deep periodontal pockets beyond the reach of a toothbrush
• Receding gums — teeth that appear longer than they used to, or visible root surfaces, indicate that the gum tissue has receded as the supporting structures break down
• Periodontal pockets — deepening spaces between the teeth and gums that harbour bacteria and are impossible to clean with normal brushing alone
• Loose or drifting teeth — teeth that feel mobile, shift position, or develop gaps between them indicate significant bone loss undermining their support
• Changes in bite alignment — a noticeable change in how your teeth come together when biting can result from teeth drifting as their bone support diminishes
• Pus between teeth and gums — discharge from the gum line indicates active infection within the periodontal pockets
• Painful chewing and tooth sensitivity — exposed root surfaces and compromised supporting tissues can make teeth sensitive to temperature and uncomfortable under chewing pressure

The 2018 Periodontal Classification System

The modern classification of periodontitis, introduced in 2018, uses a staging and grading system that provides a comprehensive picture of both the severity of damage already present and the likely rate of future progression. This framework guides treatment planning and helps predict outcomes.

Periodontitis Stages (I–IV)

Staging reflects the severity and complexity of the disease based on the amount of tissue destruction that has already occurred.

• Stage I — Initial periodontitis: early attachment loss, pocket depths up to 4mm, mild bone loss. The disease is in its earliest detectable phase and highly manageable with non-surgical treatment
• Stage II — Moderate periodontitis: moderate attachment loss, pocket depths up to 5mm, bone loss affecting the coronal third of the root. No tooth loss attributable to periodontitis
• Stage III — Severe periodontitis: significant attachment loss, pocket depths of 6mm or more, bone loss extending to the mid-third of the root or beyond, potential for additional tooth loss. May involve furcation involvement and moderate ridge defects
• Stage IV — Very severe periodontitis: all the features of Stage III plus masticatory dysfunction, fewer than 20 remaining teeth (fewer than 10 opposing pairs), tooth mobility grade 2 or higher, severe ridge defects, occlusal collapse with tooth drifting and flaring. Requires multidisciplinary rehabilitation

Periodontitis Grades (A–C)

Grading reflects the biological behaviour of the disease — how quickly it is progressing and how it is likely to respond to treatment.

• Grade A — Slow progression: bone loss is proportional to or less than expected for the duration of plaque exposure. No smoking, no diabetes. Good treatment response expected
• Grade B — Moderate progression: bone loss is consistent with what would be expected for the amount of plaque present. May include light smoking or well-controlled diabetes
• Grade C — Rapid progression: bone loss exceeds what would be expected for the plaque levels present, indicating high susceptibility. Often associated with heavy smoking or poorly controlled diabetes. Requires intensive management

Health Impacts of Untreated Periodontitis

The consequences of untreated periodontitis extend well beyond the mouth. Research has established associations between chronic periodontal inflammation and several systemic health conditions, alongside significant impacts on quality of life.

Local Effects

• Progressive bone loss — continued resorption of the alveolar bone that holds teeth in their sockets, gradually undermining their stability
• Tooth mobility and loss — the risk of tooth loss increases significantly with advancing stage. Stage IV periodontitis carries a hazard ratio of 3.73 for tooth loss compared to Stage I
• Abscess formation — deep periodontal pockets can develop acute infections that cause pain, swelling, and systemic symptoms
• Masticatory dysfunction — tooth loss and mobility impair the ability to chew effectively, which can affect diet quality and nutritional intake

Systemic Associations

• Cardiovascular disease — chronic periodontal inflammation is independently associated with an increased risk of heart disease and stroke. The inflammatory mediators released into the bloodstream may contribute to vascular inflammation
• Diabetes — the relationship is bidirectional. Active periodontitis makes diabetes harder to control, while successful periodontal treatment has been shown to improve glycaemic control
• Adverse pregnancy outcomes — periodontitis has been associated with pre-term birth and low birth weight, though the evidence for a causal relationship continues to develop
• Respiratory infections — bacteria from periodontal pockets can be aspirated into the lungs, increasing the risk of respiratory infections particularly in vulnerable populations
• Rheumatoid arthritis — shared inflammatory pathways exist between periodontitis and rheumatoid arthritis, with emerging evidence that treating one may benefit the other

Psychosocial Impact

The effects of periodontitis on quality of life are substantial and often underappreciated. Patients commonly report decreased self-confidence, poorer self-image, social isolation, and embarrassment about their appearance or breath. The loss of teeth can carry a profound sense of bereavement. Severe periodontitis ranks 77th among the 100 most disabling human conditions, reflecting its significant impact on daily life and wellbeing.

Why Treat Periodontitis?

Without treatment, advanced periodontitis leads to progressive and irreversible destruction of the tissues that hold your teeth in place. The consequences affect not only your oral health but your general wellbeing, daily function, and quality of life.

The risk of tooth loss increases dramatically with advancing disease. Stage IV periodontitis carries a nearly fourfold greater risk of tooth loss compared to Stage I. Complete tooth loss (edentulism) remains a real possibility if the disease is left to run its course unchecked.

Masticatory dysfunction caused by loose or missing teeth affects diet quality, often leading patients to avoid nutritious foods that require thorough chewing — fresh vegetables, nuts, lean meats — in favour of softer, processed alternatives. This dietary shift can have knock-on effects for general health.

Globally, severe periodontitis costs an estimated $54 billion in direct treatment costs alone. Early intervention is not only clinically preferable but also significantly more cost-effective than managing the consequences of advanced disease. Treatment at earlier stages requires less complex procedures, fewer appointments, and delivers more predictable outcomes.

Diagnosis and Assessment

Accurate diagnosis is the foundation of effective periodontal treatment. The UK clinical pathway begins with a structured screening process and, where indicated, progresses to comprehensive periodontal assessment.

Basic Periodontal Examination (BPE)

Every new patient should receive a BPE screening as part of their initial dental examination. The BPE is a quick, standardised screening tool that divides the mouth into six sections (sextants) and assigns each a score from 0 to 4 based on probing depths and the presence of bleeding, calculus, or other indicators.

• BPE 0 — healthy, no treatment needed
• BPE 1 — bleeding on probing, oral hygiene instruction needed
• BPE 2 — plaque-retentive factors (calculus, overhanging restorations), professional cleaning required
• BPE 3 — pocket depths 3.5–5.5mm, detailed charting of affected sextant required
• BPE 4 — pocket depths over 5.5mm, comprehensive full-mouth periodontal charting required

Comprehensive Periodontal Assessment

For patients with BPE scores of 3 or 4, a detailed assessment provides the complete clinical picture needed for treatment planning.

• Six-point pocket depth charting — measuring probing depths at six sites around every tooth to map the precise pattern and severity of pocketing
• Bleeding on probing (BOP) — recording which sites bleed when probed, indicating active inflammation at that location
• Recession measurement — documenting how far the gum has receded from its normal position to calculate true clinical attachment loss
• Furcation assessment — checking multi-rooted teeth for bone loss between the roots, which complicates treatment and affects prognosis
• Tooth mobility grading — assessing how much each tooth moves within its socket to gauge the extent of supporting bone loss
• Risk factor assessment — documenting smoking status, diabetes control, medication use, and other factors that influence disease behaviour and treatment response

Periodontitis Treatment Options

Periodontal treatment follows a stepwise approach based on the severity and complexity of the disease. While the damage already caused by periodontitis cannot be fully reversed, the disease can be stabilised, further destruction halted, and the conditions created for long-term maintenance of your remaining teeth. Our general dentistry services include comprehensive periodontal assessment and treatment planning.

Phase 1: Non-Surgical Periodontal Treatment

Non-surgical therapy is the cornerstone of periodontitis management and the first-line treatment for all stages of disease. It aims to reduce the bacterial load within the periodontal pockets, remove plaque, calculus, and bacterial toxins from the root surfaces, and create an environment that allows the inflamed tissues to heal.

• Oral hygiene instruction — the single most important element of periodontal treatment. Your dental team will work with you to develop an effective daily cleaning routine, including the correct brushing technique and the right interdental cleaning aids for your specific situation
• Scaling and root surface debridement — thorough cleaning of the root surfaces below the gum line to remove plaque, calculus, and bacterial biofilm. This is typically carried out under local anaesthesia for comfort and takes place over several appointments
• Risk factor management — smoking cessation advice, diabetes management support, and addressing any modifiable factors that influence the disease process

Non-surgical treatment alone resolves 60 to 80% of periodontitis cases. Many patients achieve stable pocket depths and healthy gum tissue without the need for surgical intervention, provided they maintain excellent oral hygiene and attend regular follow-up appointments.

Phase 2: Reassessment

Six to eight weeks after completing non-surgical treatment, your dental team will reassess all clinical parameters. Pocket depths, bleeding scores, and plaque levels are re-measured and compared against the baseline recordings. Sites that have responded well will show reduced pocket depths and less bleeding. Sites with residual pocketing of 5mm or more that continue to bleed on probing are identified as requiring further intervention.

Phase 3: Advanced Periodontal Treatment

For persistent pockets that have not responded adequately to non-surgical therapy, advanced treatment options are available.

Periodontal Surgery

• Access flap surgery — the gum tissue is carefully reflected to provide direct access to the root surfaces and underlying bone, allowing thorough debridement of areas that could not be adequately cleaned non-surgically
• Pocket reduction surgery — reshaping the bone and gum tissue to eliminate deep pockets, creating a tooth contour that is easier for the patient to keep clean during daily maintenance
• Regenerative procedures — bone grafts, guided tissue regeneration membranes, and biologic agents may be used in specific situations to encourage the body to regenerate some of the lost periodontal support

Gum Graft Surgery

Where significant gum recession has exposed root surfaces, gum graft surgery can cover the exposed areas. Tissue may be taken from the palate or a donor source and placed over the recession site to protect the root, reduce sensitivity, and improve the gum contour. This is particularly beneficial for teeth with recession that is progressing or causing symptoms.

Phase 4: Multidisciplinary Rehabilitation (Stage IV)

Stage IV periodontitis presents unique challenges that often require an interdisciplinary treatment approach. When teeth have been lost, remaining teeth have drifted, and the bite has collapsed, comprehensive rehabilitation planning is needed.

• Orthodontic treatment — repositioning teeth that have drifted or flared as a result of bone loss, restoring a functional and maintainable alignment
• Dental implants — replacing lost teeth where adequate bone support remains or can be augmented, restoring chewing function and preventing further tooth drift
• Prosthetic rehabilitation — bridges, dentures, or full mouth reconstruction to replace missing teeth and restore masticatory function in severe cases
• Rigorous supportive care — rehabilitation must be underpinned by a comprehensive maintenance programme before, during, and after any reconstructive treatment to protect the investment and maintain stability

Supportive Periodontal Care (Maintenance)

Supportive periodontal care is arguably the most critical phase of periodontitis management. Active treatment controls the disease, but long-term maintenance prevents it from returning. Without consistent follow-up care, the improvements achieved during treatment can be lost within months.

Maintenance appointments typically take place every three to four months — more frequently than standard dental check-ups — because periodontitis-susceptible patients require closer monitoring and more regular professional intervention to maintain stability.

• Monitoring of periodontal stability — re-measuring pocket depths, bleeding scores, and attachment levels at each visit to detect any signs of disease recurrence
• Reinforcement of oral hygiene — reviewing and refining your home care routine, troubleshooting any areas that are difficult to clean, and updating your technique as needed
• Professional prophylaxis — removal of any plaque and calculus that has accumulated since the last visit, particularly in areas that are difficult to access with home care alone
• Early intervention — if any sites show signs of disease recurrence, targeted treatment can be provided immediately before significant tissue destruction occurs

Research from Guy's Hospital found that 12.77% of patients achieved “stable periodontitis” at the point of entering supportive care, while 48.23% met the defined endpoints of therapy. Molar teeth consistently show lower success rates than other teeth and require particularly careful monitoring during maintenance. Your dental hygienist plays a central role in delivering supportive periodontal care and helping you maintain the results of treatment.

Prevention of Periodontitis

While genetic susceptibility cannot be modified, most of the key risk factors for periodontitis are within your control. Adopting consistent preventive habits significantly reduces the likelihood of developing periodontal disease or, if you are already susceptible, slows its progression.

• Effective twice-daily brushing — using a fluoride toothpaste and a systematic technique that reaches all tooth surfaces, paying particular attention to the gum line where plaque accumulates most
• Daily interdental cleaning — using floss or interdental brushes to clean between the teeth is essential, as a toothbrush alone cannot reach these surfaces where periodontal disease frequently begins
• Regular dental visits for BPE screening — routine check-ups that include periodontal screening allow early detection of gum disease at its most treatable stage
• Smoking cessation — stopping smoking is the single most impactful step you can take to reduce your periodontal disease risk and improve treatment outcomes
• Diabetes management — maintaining good blood sugar control reduces the risk and severity of periodontal disease and improves the response to treatment
• Healthy, balanced diet — a diet low in sugar and rich in vitamins and minerals supports immune function and tissue repair within the periodontium
• Managing dry mouth — if medication or medical conditions reduce your saliva flow, discuss strategies with your dental team to maintain moisture and protect against bacterial accumulation

When to See a Dentist About Gum Disease

Because periodontitis can progress silently for years, routine screening is the most reliable way to detect the condition early. However, certain signs should prompt you to arrange an appointment sooner rather than waiting for your next scheduled check-up.

• Gums that bleed when brushing, flossing, or eating
• Persistent bad breath that does not improve with thorough oral hygiene
• Gums that appear to be pulling away from the teeth, exposing more of the root surface
• Teeth that feel loose, have shifted position, or show new gaps between them
• A change in how your teeth fit together when you bite
• A family history of gum disease, which may indicate genetic susceptibility warranting closer monitoring

Our dental team at St Paul's Medical & Dental provides comprehensive periodontal assessments including BPE screening, detailed periodontal charting, and a full range of non-surgical and advanced treatment options. Book a consultation to discuss any concerns about your gum health and take the first step toward effective management.

Frequently Asked Questions About Periodontitis