{
  "title": "Periodontitis and cardiovascular disease: from association to the interventional trials",
  "subtitle": "What is causal, what may be confounded, and what periodontal treatment can actually change",
  "slides": [
    {
      "kind": "cover",
      "heading": "Gum inflammation is not the same as a heart attack risk factor",
      "body": "Periodontitis is a bacterial inflammatory disease of the tissues supporting teeth. It is associated with cardiovascular disease, but association does not prove that periodontitis causes heart attacks or strokes.",
      "bullets": [
        "The question is being tested with genetics and treatment trials.",
        "The most reliable benefit of periodontal therapy is control of gum infection and inflammation."
      ]
    },
    {
      "kind": "why",
      "heading": "Why the mouth and arteries are studied together",
      "body": "In periodontitis, plaque bacteria and inflammatory cells affect the gingiva, periodontal ligament, cementum and alveolar bone. Bleeding tissues can allow bacterial products and inflammatory mediators to enter the bloodstream. This creates a biologically plausible link with vascular inflammation, but smoking, diabetes, obesity, age and socioeconomic factors can affect both conditions.",
      "bullets": [
        "Atherosclerosis involves fatty and fibrous plaque within arterial walls.",
        "Periodontitis involves loss of attachment between tooth and alveolar bone.",
        "Shared risk factors can make an association look stronger than a direct cause."
      ]
    },
    {
      "kind": "steps",
      "heading": "What the intervention studies actually test",
      "body": "A periodontal trial usually starts with examination of six sites around each tooth, a periodontal probe, bleeding assessment, radiographs when indicated, and measurement of pocket depth and attachment loss.",
      "bullets": [
        "Remove supragingival plaque and calculus with a toothbrush, interdental cleaning and professional instrumentation.",
        "Perform subgingival debridement with ultrasonic instruments and hand curettes to disrupt biofilm and remove calculus from root surfaces.",
        "Reassess bleeding, pocket depths and plaque control after healing.",
        "Use periodontal surgery, extraction of a hopeless tooth, or specialist treatment only when anatomy and disease severity require it.",
        "Track vascular markers or cardiovascular events separately. A change in gum bleeding is not automatically proof of fewer heart attacks."
      ]
    },
    {
      "kind": "rule",
      "heading": "The rule that matters: treat periodontitis, but do not call it heart prevention",
      "body": "Periodontal treatment is indicated to preserve teeth, reduce bleeding, control infection and limit further destruction of periodontal attachment and alveolar bone. Current evidence does not justify replacing statins, blood-pressure treatment, diabetes care, smoking cessation or prescribed cardiovascular medicines with gum treatment.",
      "bullets": [
        "Brush twice daily with fluoride toothpaste, then spit without rinsing.",
        "Clean between teeth daily. Interdental brushes are preferable where the space allows; floss remains useful where a brush cannot fit.",
        "Do not stop cardiovascular medicines before dental treatment without the prescribing clinician."
      ]
    },
    {
      "kind": "myth",
      "heading": "Mythbuster: genetics can test causality, but they are not a final verdict",
      "body": "Mendelian-randomisation studies use inherited genetic variants linked with periodontitis to ask whether a genetically predicted exposure is associated with cardiovascular disease. This can reduce some confounding, but results depend on the quality of the genetic instruments and assumptions such as no pleiotropy.",
      "bullets": [
        "An observational association can reflect shared causes or reverse causation.",
        "A genetic signal can support or weaken a causal hypothesis, but it does not reproduce periodontal treatment.",
        "Treatment trials are needed to test whether changing gum disease changes cardiovascular outcomes."
      ]
    },
    {
      "kind": "personalise",
      "heading": "Make the evidence relevant to your mouth",
      "body": "Risk is not identical for every patient. A person with deep bleeding pockets, smoking exposure, diabetes or previous tooth loss may need a more intensive periodontal plan than someone with gingivitis and intact attachment.",
      "bullets": [
        "Ask whether the diagnosis is gingivitis or periodontitis.",
        "Ask for pocket depths, bleeding sites, attachment loss and bone changes on radiographs when relevant.",
        "Tell the dental team about diabetes, smoking, pregnancy, anticoagulants and cardiovascular disease.",
        "Follow the maintenance interval based on recurrent bleeding, plaque control, pocket anatomy and risk factors."
      ]
    },
    {
      "kind": "dentist",
      "heading": "When to see a dentist",
      "body": "Arrange a dental assessment for bleeding that persists, swollen or tender gums, bad taste or odour, gum recession, loose teeth, drifting teeth, or pain when chewing. Urgent care is needed for facial swelling, fever, difficulty swallowing or difficulty breathing.",
      "bullets": [
        "A dentist can distinguish gingival inflammation from periodontal attachment loss.",
        "Treatment may include professional debridement, local anaesthetic, behavioural instruction, referral to a periodontist, or removal of a tooth that cannot be maintained.",
        "A cardiovascular history helps the dental team plan safely, but it does not change the need to control the periodontal infection."
      ]
    },
    {
      "kind": "closer",
      "heading": "The answer in one sentence",
      "body": "Periodontitis and cardiovascular disease share plausible biology and observed associations, while genetic and treatment studies continue to test causality. Treat periodontitis for oral health and possible systemic benefit, but continue evidence-based cardiovascular prevention.",
      "bullets": [
        "Book a periodontal examination if your gums bleed or your teeth feel loose.",
        "Bring your medication list and medical history.",
        "Dental Nation can help assess the cause and map the next clinical step."
      ]
    }
  ],
  "report": {
    "summary": "Periodontitis is a chronic inflammatory disease caused by dysbiotic dental biofilm that destroys periodontal attachment and alveolar bone. Cardiovascular disease is associated with periodontitis in observational research, and plausible mechanisms include transient bacteraemia, bacterial products and systemic inflammatory signalling. Confounding by smoking, diabetes, obesity, age and social factors remains important. Mendelian-randomisation studies can test causal hypotheses using genetic variants, but their conclusions depend on methodological assumptions. Periodontal treatment clearly improves periodontal clinical outcomes. Evidence that it prevents heart attacks, strokes or other major cardiovascular events remains insufficient to replace established cardiovascular prevention.",
    "sections": [
      {
        "heading": "Anatomy and mechanism",
        "body": "Periodontitis affects the gingiva, periodontal ligament, cementum and alveolar bone. Subgingival biofilm triggers host inflammation, periodontal pocket formation, connective-tissue breakdown and bone resorption. Ulcerated pocket epithelium may permit bacterial components and inflammatory mediators to enter circulation. These mechanisms are biologically plausible but do not by themselves prove that periodontitis causes atherosclerotic events."
      },
      {
        "heading": "What observational studies show",
        "body": "People with periodontitis often have higher cardiovascular disease burden, but observational studies can be distorted by common risk factors, differences in healthcare access, health behaviours and disease measurement. Association should not be presented as proof of causation."
      },
      {
        "heading": "Mendelian randomisation",
        "body": "This method uses inherited variants associated with periodontitis as proxies for lifelong exposure. It can reduce some confounding and reverse-causation problems. Weak instruments, population differences, measurement error and pleiotropy can still bias results. Genetic evidence is complementary to, not a substitute for, randomised treatment evidence."
      },
      {
        "heading": "What periodontal therapy moves",
        "body": "Initial therapy consists of oral-hygiene instruction, plaque control, risk-factor management and professional supra- and subgingival instrumentation. Reassessment determines whether residual pockets, bleeding, furcation involvement, mucogingival problems or hopeless teeth require surgery, extraction or specialist care. These steps target periodontal infection and inflammation. A change in periodontal measurements or inflammatory biomarkers does not equal proof of fewer cardiovascular events."
      },
      {
        "heading": "Patient safety and communication",
        "body": "Patients should continue prescribed cardiovascular medicines unless their medical clinician changes them. Dental assessment is appropriate for persistent bleeding, swelling, recession, halitosis, mobility or chewing discomfort. Facial swelling with fever or airway symptoms requires urgent medical attention."
      }
    ]
  },
  "guardrails": [
    "Do not claim that periodontitis causes heart attacks or strokes.",
    "Do not imply that periodontal treatment replaces statins, antihypertensives, diabetes care, smoking cessation or other cardiovascular prevention.",
    "Do not invent trial statistics, success rates, survival percentages or prices.",
    "Do not state that hydroxyapatite is equivalent to fluoride.",
    "Do not recommend mouth taping.",
    "Do not present charcoal whitening as proven.",
    "Do not claim alcohol mouthwash causes cancer.",
    "Recommend interdental brushes where the gap allows, while recognising that floss remains useful.",
    "Tell patients to spit and not rinse after brushing.",
    "Use Western professional imagery only, with no traditional, cultural or religious attire references.",
    "Avoid em dashes."
  ],
  "sources_consulted": [
    "Tonetti MS, Greenwell H, Kornman KS. Staging and grading of periodontitis: Framework and proposal of a new classification and case definition. Journal of Periodontology, 2018.",
    "Sanz M et al. Periodontitis and cardiovascular diseases: Consensus report. Journal of Clinical Periodontology, 2020.",
    "European Federation of Periodontology and American Academy of Periodontology consensus materials on periodontitis and systemic diseases.",
    "Cochrane reviews of periodontal treatment and cardiovascular outcomes.",
    "World Health Organization oral health guidance."
  ]
}