Periodontal Diseases: Gingivitis and Periodontitis — Diagnosis and Management

Periodontal Diseases: Gingivitis and Periodontitis — Diagnosis and Management

Periodontal diseases affect the tissues that surround and support the teeth. They include gingival inflammation, most commonly plaque-induced gingivitis, and periodontitis, in which inflammation is associated with loss of the tooth’s supporting attachment and alveolar bone. Gingivitis is often reversible when the cause is controlled. Periodontitis can usually be stabilised and managed, but lost attachment and bone are not routinely restored by simple cleaning alone. Early recognition, accurate examination, effective daily plaque control, risk-factor management and professional follow-up help protect oral function and reduce the risk of tooth loss.

This study guide expands the course slide resources and applies current periodontal terminology. It is written for health-science learners and does not replace supervised clinical training, a dental diagnosis or local Ugandan protocols. A trained dental professional should assess individual patients and decide treatment according to the findings, available facilities, patient preferences and referral pathways.

1. The periodontium and key terms

The periodontium is the group of tissues that support and attach a tooth. Its main parts are the gingiva, periodontal ligament, cementum covering the tooth root and alveolar bone. Disease may affect the gingiva alone or damage deeper supporting structures.

• Gingiva: the gum tissue surrounding the teeth and covering the alveolar processes. Healthy gingiva is generally firm and closely adapted to the tooth, though colour and appearance vary with pigmentation and individual anatomy.
• Dental plaque biofilm: a structured community of microorganisms in a matrix that forms on teeth and restorations. Persistent biofilm at the gingival margin can provoke inflammation in a susceptible host.
• Calculus (tartar): mineralised plaque. It is not itself the primary cause of periodontitis, but its rough surface can retain biofilm and it cannot be removed by ordinary brushing once firmly deposited.
• Gingivitis: inflammation confined to the gingiva, typically causing redness, swelling and bleeding on gentle probing or brushing, without periodontitis-related clinical attachment loss or bone loss.
• Periodontal pocket: an abnormally deepened space between a tooth and the gingiva. Pocket depth must be interpreted with gum position, clinical attachment level, bleeding and other findings; a deep reading alone does not establish the full diagnosis.
• Probing depth (PD): the distance from the gingival margin to the base of the sulcus or pocket, measured with a periodontal probe.
• Clinical attachment level (CAL): the distance from a fixed tooth landmark, usually the cementoenamel junction, to the base of the pocket. CAL helps identify loss of tooth-supporting attachment.
• Gingival recession: movement of the gum margin away from the crown, exposing part of the root. Recession can result from several causes and is not, by itself, proof of periodontitis.
• Bleeding on probing (BOP): bleeding observed after gentle probing. It is a sign of inflammation at a site and should be recorded alongside plaque and pocket measurements.
• Furcation involvement: loss of supporting tissues between the roots of a multi-rooted tooth.
• Tooth mobility: movement of a tooth beyond normal physiological movement. It can have periodontal and non-periodontal causes and is assessed in context.
• Suppuration: discharge of pus from the gingival sulcus or pocket, suggesting active infection or an abscess and requiring professional assessment.

2. Classification and patterns of disease

Current international classification distinguishes periodontal health, gingival diseases and conditions, periodontitis, and other conditions affecting the periodontal tissues. Older teaching slides may use labels such as “chronic” and “aggressive” periodontitis. In the 2017 World Workshop classification, these former categories are grouped within periodontitis and described using stage and grade, while recognising necrotising disease and periodontitis as a manifestation of certain systemic diseases as distinct forms.

3. Causes and pathogenesis

Dental plaque biofilm at and below the gingival margin triggers a host inflammatory response. When plaque remains undisturbed, the microbial community can become more disease-associated. In gingivitis, inflammation is limited to the gum tissue. In susceptible people, persistent inflammation may involve destruction of periodontal ligament fibres and resorption of alveolar bone. The depth and distribution of damage vary across teeth and patients; the amount of visible plaque alone does not predict severity.

Calculus, overhanging or poorly contoured restorations, crowded teeth, appliances and other plaque-retentive features can make cleaning difficult. Systemic and behavioural factors modify inflammation and progression. Smoking can mask bleeding while worsening periodontal risk and treatment response. Diabetes, especially when glycaemic control is poor, is an important modifying factor; periodontal inflammation and diabetes can influence each other, but a statistical association should not be described as proof of a simple one-way cause.

Risk and modifying factors to assess

4. Clinical features and complications

Gingivitis

Common findings include erythema or colour change, oedema, rounded or swollen gingival margins, tenderness and bleeding during brushing or gentle probing. Patients may report blood on a toothbrush, unpleasant taste, halitosis or gum discomfort. Gingivitis may be generalised or localised and may be modified by hormonal changes, medicines or systemic illness. There should not be periodontitis-related attachment or bone loss; apparent recession or a deep probing measurement needs careful interpretation rather than automatic classification as periodontitis.

Periodontitis

Periodontitis may progress with few symptoms. Possible findings include persistent bleeding on probing, periodontal pocketing, clinical attachment loss, radiographic alveolar bone loss, gingival recession, root sensitivity, suppuration, furcation involvement, tooth mobility, drifting teeth, altered contacts when biting and eventual tooth loss. Pain is not a reliable measure of disease severity, and a person may have substantial attachment loss with little pain.

Acute presentations

Necrotising gingivitis often presents with acute gingival pain, ulceration and necrosis of interdental papillae, bleeding and marked halitosis; fever or malaise may occur in more severe illness. A periodontal abscess may present as a tender local swelling beside a tooth, pus, a deep pocket, mobility and pain on biting. Fever, facial swelling, spreading redness, trismus, difficulty swallowing, breathing difficulty, dehydration or a rapidly worsening condition needs urgent escalation through local emergency or specialist pathways.

Potential consequences

• Progressive attachment and alveolar bone loss with tooth mobility or loss.
• Root exposure, sensitivity, food trapping, aesthetic concerns and impaired chewing.
• Recurrent periodontal abscesses, pain or acute infection.
• Difficulty maintaining oral hygiene around deep pockets and irregular tooth positions.
• Financial and social effects, including reduced confidence, speech or dietary comfort.

Periodontitis is associated with several systemic conditions, including diabetes, but evidence differs by condition and association does not mean that gum disease alone caused a systemic illness. Oral health and general health should both be assessed without making unsupported causal claims.

5. History, examination and investigations

Focused history

Begin with the patient’s main concern and ask permission before examining. Establish when bleeding, swelling, pain or looseness started and whether it is localised or widespread. Ask about spontaneous bleeding, pain on brushing or chewing, bad breath, pus, gum recession, sensitivity, previous dental treatment and periodontal cleaning. Ask about smoking or other tobacco, diabetes and glycaemic care, relevant medicines, allergies, dry mouth, pregnancy where relevant, oral-hygiene practices, diet, previous dental attendance and barriers to care. Explore the patient’s understanding and goals using respectful, non-blaming language.

Extra-oral and intra-oral examination

1. Check general safety: look for facial asymmetry, swelling, fever, malaise, trismus or difficulty swallowing or breathing. Escalate urgent concerns before routine charting.
2. Inspect soft tissues: assess the lips, cheeks, tongue, palate, floor of mouth and gingiva for colour, contour, ulceration, necrosis, bleeding, enlargement, recession, suppuration and plaque.
3. Assess plaque and local factors: note plaque, calculus, food impaction, crowded teeth, appliances and restorations that may retain plaque or impede cleaning.
4. Screen systematically: use the screening method taught in the training institution and follow its referral thresholds. A screening score identifies the need for further examination; it does not replace a diagnosis.
5. Complete periodontal charting when indicated: measure probing depth and gingival margin or recession at six sites per tooth; calculate clinical attachment level where appropriate; record bleeding on probing, suppuration, plaque, mobility and furcation involvement.
6. Assess teeth and function: note missing teeth and the reason where known, migration, occlusion, caries, restorations and other conditions that affect prognosis or treatment planning.

Making and describing the diagnosis

A periodontitis case definition used in the current classification requires detectable interdental clinical attachment loss at two or more non-adjacent teeth, or buccal/oral attachment loss of at least 3 mm with pocketing of at least 3 mm at two or more teeth, when these findings cannot be attributed to other causes such as traumatic recession, cervical caries, a third-molar-related distal defect, an endodontic lesion draining through the marginal periodontium or a vertical root fracture. This is a clinical framework for trained examiners, not a self-diagnosis rule.

Once periodontitis is diagnosed, clinicians describe it using stage and grade. Stage I to IV summarises severity, tooth loss attributable to periodontitis and management complexity. Grade A to C estimates evidence or risk of progression and treatment response, incorporating direct or indirect evidence and modifiers such as smoking and diabetes. Distribution may be described as localised or generalised, or by a molar-incisor pattern. A complete diagnosis also records periodontal health or inflammation, relevant risk factors, extent, affected teeth and any acute condition.

Investigations

Periodontal probing and charting are central clinical investigations. Dental radiographs may show the pattern and extent of alveolar bone loss and assist prognosis or treatment planning, but they do not measure active inflammation and should be requested only when indicated and likely to inform care. Consider medical review or tests when the history or examination suggests a systemic contributor; testing should be guided by a qualified clinician and local protocol. Document findings, the patient’s concerns, consent, advice, treatment or referral, and the agreed follow-up plan.

6. Stepwise management

The goals are to control inflammation and biofilm, reduce modifiable risks, make oral hygiene achievable, preserve teeth where possible, treat acute infection and maintain stability. Management depends on disease activity, extent, patient priorities, systemic factors, tooth prognosis, available services and the clinician’s scope of practice. The EFP stage I–III guideline describes a stepwise approach: behaviour and risk-factor change with supragingival plaque control; professional subgingival instrumentation when indicated; additional treatment for residual pockets or complex disease; then supportive periodontal care. The plan should be explained and agreed with the patient.

Step 1: education, self-care and risk reduction

• Explain the difference between gingivitis and periodontitis and why gum disease may be painless.
• Demonstrate gentle, effective brushing along the gumline twice daily with fluoride toothpaste. Adapt the brush, grip or caregiver support for age, dexterity or disability.
• Recommend appropriately sized interdental brushes or floss according to spaces and skill; demonstrate use rather than assuming the patient knows the technique.
• Arrange professional supragingival removal of plaque and calculus when needed. Mechanical cleaning supports, but does not replace, the patient’s daily plaque control.
• Offer non-judgemental support for tobacco cessation and encourage diabetes care and glycaemic review with the responsible clinician.
• Review medicines and local contributing factors. Refer or coordinate care if the suspected cause is outside the dental clinician’s authority.

Step 2: professional subgingival treatment

For periodontitis, trained dental personnel may provide subgingival instrumentation or scaling and root surface debridement to disrupt biofilm and remove deposits from periodontal pockets. Treatment may require more than one session. Explain expected temporary sensitivity or bleeding, aftercare and the need for re-evaluation. Reassess plaque control, bleeding, pocket measurements and patient comfort after an appropriate healing interval. If disease remains active, revise the plan or refer rather than simply repeating treatment without reassessment.

Step 3: residual pockets, complex disease and referral

Persistent deep pockets, furcation involvement, vertical defects, progressive mobility, suspected mucogingival problems or advanced disease may require specialist assessment and possible periodontal surgery or regenerative procedures. Teeth with a poor prognosis should be discussed with the patient; extraction may be considered only after an individual assessment of prognosis, alternatives and consent. Coordinate care when diabetes, medicine-related enlargement or another systemic issue affects treatment.

Step 4: supportive periodontal care

Successfully treated periodontitis requires long-term maintenance because recurrence can occur even after apparent improvement. Supportive visits are individualised according to disease history, risk factors, oral hygiene, examination and previous response. Review symptoms, plaque control, smoking, glycaemic context, bleeding, pocket depth, mobility and radiographs when indicated; provide professional biofilm removal and re-instrument sites only when clinically needed. Encourage the patient to return if bleeding, swelling, discharge, looseness or pain recurs.

Management of plaque-induced gingivitis

Most plaque-induced gingivitis is managed by explaining the cause, improving daily plaque removal, removing professional deposits and addressing local plaque-retentive factors. Reassess response and check adherence barriers or alternative diagnoses if inflammation persists. Drug-induced enlargement may need a coordinated medical and dental review; patients should not independently stop a prescribed medicine. Persistent ulcers, unusual lesions, severe pain, spontaneous bleeding or tissue changes need further examination and referral.

Necrotising disease and periodontal abscess

Acute necrotising disease or a suspected periodontal abscess needs prompt dental assessment. Management is selected by a trained clinician and may include careful local cleaning or drainage, pain relief, hydration advice, oral-hygiene support, evaluation of predisposing factors and review. Systemic antibiotics are not routine for uncomplicated gingivitis or periodontitis and do not replace mechanical treatment or drainage. They may be considered by a qualified clinician when systemic involvement, spreading infection or another specific indication is present, following local antimicrobial guidance. Urgent hospital-level care is needed if airway or swallowing problems, rapidly progressive swelling or serious systemic illness develops.

7. Prevention and patient counselling

• Encourage twice-daily brushing and daily cleaning between teeth using a method the patient can maintain.
• Discuss routine dental assessment, with more frequent review where individual disease risk or previous periodontitis makes it appropriate.
• Explain that bleeding gums are a reason to improve technique and seek assessment, not to stop brushing the area.
• Offer practical tobacco-cessation advice and connect interested patients to available support.
• Encourage patients with diabetes to discuss glycaemic control with their usual care team; do not promise that dental treatment alone will control diabetes.
• Support oral health during pregnancy and puberty with gentle plaque control and professional assessment of persistent bleeding or enlargement.
• Address access barriers with realistic, local options and clear follow-up. Prevention should be supportive, affordable and respectful.

8. Practical clinical sequence for a learner

1. Prioritise safety: ask about fever, spreading swelling, swallowing and breathing; escalate emergencies.
2. Listen: identify the patient’s main concern and ask about bleeding, pain, mobility and previous treatment.
3. Review modifiers: document hygiene, tobacco, diabetes, relevant medicines, allergies, dry mouth and access barriers.
4. Examine and chart: inspect gingiva and soft tissues, assess plaque and calculus, screen and perform full charting when indicated.
5. Investigate selectively: request radiographs or medical assessment only when clinically indicated and likely to change the plan.
6. Explain and agree: discuss the diagnosis, goals, options, limitations, risks, expected review and referral where needed; obtain consent.
7. Treat within competence: provide prevention and appropriate professional therapy or arrange a timely referral.
8. Review: reassess inflammation, plaque control, pocket findings, patient goals and risk factors; continue supportive care for periodontitis.

9. Worked example

A 46-year-old patient reports blood on the toothbrush and a bad taste but little pain. They smoke and have type 2 diabetes. Examination finds generalised plaque, red swollen gingiva, bleeding on gentle probing and several deep periodontal pockets. The full chart records attachment loss and recession at multiple non-adjacent teeth. Radiographs are requested because the findings will help assess bone support and treatment planning. There is no facial swelling, fever or difficulty swallowing.

Bleeding alone would not establish periodontitis, but the combination of charted attachment loss and compatible clinical findings warrants a full diagnosis and staging/grading by a trained clinician. The plan includes discussion of smoking and diabetes as modifiers, personalised brushing and interdental cleaning instruction, professional periodontal treatment, re-evaluation and supportive maintenance. The patient is told that minimal pain does not rule out disease and is given clear advice to seek urgent care if swelling, fever, difficulty swallowing or breathing develops.

10. Common errors to avoid

• Calling every episode of bleeding gingiva “periodontitis” without checking for attachment or bone loss.
• Assuming that absence of pain means periodontal health.
• Relying on a screening score alone instead of arranging full charting when indicated.
• Interpreting probing depth without recording gum margin position and clinical attachment level.
• Describing calculus as the only cause or removing it without supporting daily plaque control.
• Using older labels such as chronic/aggressive periodontitis as current diagnoses without explaining the updated stage-and-grade classification.
• Prescribing antibiotics routinely for uncomplicated gum disease or using them in place of professional treatment.
• Failing to review smoking, diabetes, medicines, disability, cost or other barriers that affect treatment success.
• Ending care after initial treatment instead of arranging re-evaluation and long-term supportive maintenance.

11. Key takeaways

• The periodontium includes gingiva, periodontal ligament, cementum and alveolar bone.
• Gingivitis involves gum inflammation without periodontitis-related attachment or bone loss and is often reversible with effective plaque control.
• Periodontitis involves loss of supporting attachment and bone; it may progress with little pain and needs professional diagnosis, treatment and ongoing maintenance.
• Diagnosis combines history, full periodontal examination, charting and indicated imaging; staging and grading describe severity, complexity and progression risk.
• Biofilm control, professional instrumentation when indicated, tobacco cessation, diabetes care and tailored follow-up support periodontal stability.
• Spreading swelling, fever with systemic illness, difficulty swallowing or breathing, significant trismus or rapid deterioration requires urgent escalation.

12. Self-assessment questions

1. Name the four principal tissues of the periodontium.
2. How does gingivitis differ from periodontitis in terms of attachment and bone support?
3. What is the difference between probing depth and clinical attachment level?
4. List five risk or modifying factors that should be reviewed during periodontal history taking.
5. What information is recorded in a full periodontal chart?
6. What do stage and grade describe in the current periodontitis classification?
7. Why are antibiotics not a substitute for plaque disruption and professional periodontal treatment?
8. Give four findings that need urgent dental or emergency referral.

Suggested answers

1. Gingiva, periodontal ligament, cementum and alveolar bone.
2. Gingivitis is inflammation limited to the gingiva without periodontitis-related attachment or bone loss; periodontitis includes destructive loss of periodontal attachment and alveolar bone.
3. Probing depth measures from the gum margin to the base of the sulcus or pocket; clinical attachment level measures from a fixed tooth landmark, usually the cementoenamel junction, to the base of the pocket.
4. Examples include plaque-control difficulties, smoking, diabetes, relevant medicines, hormonal changes, systemic or immune conditions, local plaque-retentive factors and access barriers.
5. At indicated sites, probing depth, gingival margin or recession, clinical attachment level, bleeding on probing, suppuration, plaque, mobility and furcation involvement, alongside affected teeth and other relevant findings.
6. Stage describes disease severity, tooth loss attributable to periodontitis and complexity; grade estimates progression risk and response, incorporating progression evidence and modifiers such as smoking and diabetes.
7. Antibiotics do not remove biofilm or calculus and do not replace mechanical debridement, drainage or other indicated source control. They are reserved for specific clinical indications under local guidance.
8. Examples include rapidly increasing facial/neck swelling, fever with systemic illness, difficulty swallowing or breathing, floor-of-mouth swelling, significant trismus, dehydration or rapid deterioration.

Further learning and references

• Periodontal Diseases — course teaching slides (supplied resource; some terminology reflects older classifications).
• Gingival and Periodontal Diseases — course teaching slides (supplied resource).
• American Dental Association: Periodontitis — oral health topic.
• European Federation of Periodontology: evidence-based guideline on treatment of stage I–III periodontitis.
• US Centers for Disease Control and Prevention: About periodontal (gum) disease.
• World Health Organization: Oral health fact sheet.
• Papapanou et al.: 2017 World Workshop consensus report on periodontitis classification and case definition.
• Chapple et al.: consensus report on periodontal health and gingival diseases.

Continue learning

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