Association
Do oral and systemic conditions occur together consistently across well-designed studies?
ORAL SIGNAL EVIDENCE INDEX
What is actually supported?
A living index of the evidence connecting oral health and systemic health — graded without collapsing association, causality, treatment effect and economics into the same claim.
6TOPICS TRACKED
1STRONG SIGNAL
3MODERATE SIGNAL
2EMERGING SIGNAL
THE CORE DISTINCTION
A relationship can be real without proving that treating the mouth changes the body.
That distinction is the foundation of the index. We separate four questions that are often blended together in oral-systemic health coverage.
HOW WE GRADE IT
Four questions. Four different standards.
Causality
Is there evidence that one condition contributes to the other rather than simply sharing risk factors?
Intervention
Does treating the oral condition change a meaningful systemic health outcome?
Economics
Does the intervention create measurable value through lower cost, better outcomes or improved care delivery?
CONDITION INDEX
Explore the evidence by topic.
01Strong
Diabetes
Among the best-developed oral-systemic evidence areas. A 2026 longitudinal meta-analysis found associations in both directions between diabetes and periodontitis.
- Relationship
- Bidirectional association supported by longitudinal evidence
- Causality
- Biologically plausible; causal pathways remain an active research area
- Intervention
- Periodontal treatment improves oral outcomes; systemic effects require condition- and outcome-specific interpretation
02Moderate
Cardiovascular disease
The association is important, but readers should not equate periodontal treatment with proven cardiovascular-event prevention.
- Relationship
- Consistent epidemiologic association with periodontal disease
- Causality
- Shared risk factors and inflammatory pathways complicate causal inference
- Intervention
- Evidence that periodontal treatment prevents cardiovascular events is not established
03Moderate
Pregnancy outcomes
A meaningful clinical integration area where access, prevention and referral may matter even when causal claims remain limited.
- Relationship
- Periodontal disease has been associated with adverse pregnancy outcomes
- Causality
- Uncertain and affected by confounding
- Intervention
- Oral care during pregnancy is important; systemic outcome effects remain nuanced
04Emerging
Dementia and cognitive decline
Scientifically interesting and highly vulnerable to overstatement. This is an area where evidence discipline matters most.
- Relationship
- Observational associations have been reported
- Causality
- Not established
- Intervention
- No established evidence that dental treatment prevents dementia
05Moderate
Respiratory health
A practical integration area where patient setting and baseline risk may matter more than broad population claims.
- Relationship
- Oral health can interact with respiratory risk, especially in medically vulnerable populations
- Causality
- Context-dependent
- Intervention
- Oral hygiene interventions may be relevant in selected institutional and high-risk settings
06Emerging
Chronic kidney disease
A developing evidence area worth monitoring, particularly in medically complex populations.
- Relationship
- Associations with periodontal disease have been described
- Causality
- Not established
- Intervention
- Insufficient for broad systemic treatment claims
SIGNAL RATINGS
What the labels mean.
Replicated, mature relationship evidence with a substantial evidence base. Strong still does not automatically mean causal.
Meaningful and reasonably consistent evidence, with important limitations around mechanism, intervention or generalizability.
Scientifically plausible or observationally interesting, but not mature enough for confident broad claims.
The rating describes the maturity of the relationship evidence. It is not a treatment recommendation and does not imply that an oral intervention has been proven to improve a systemic outcome.
CURRENT ANALYSIS
Where the evidence is moving.
Science11 min read
The Oral-Systemic Health Evidence Map: What We Know, What We Don’t, and What’s Overhyped
The mouth and the rest of the body are connected. That does not make every oral-systemic claim equally strong. Here is the evidence hierarchy that matters.
Read analysis →Data10 min read
Why Your Medical Record Still Doesn’t Know What’s Happening in Your Mouth
Healthcare has spent decades building interoperable medical records. Dental data still often sits outside them — even when it could change medication safety, screening, referrals and risk decisions.
Read analysis →Data16 min read
The Mouth Is Healthcare's Missing Data Layer
Dental encounters generate signals that rarely make it into the rest of healthcare. That separation is becoming harder to justify.
Read analysis →Science14 min read
Diabetes and Periodontitis: What the 2026 Evidence Actually Says
A major longitudinal synthesis strengthens the case for a bidirectional relationship — without eliminating the need for causal discipline.
Read analysis →A LIVING INDEX
The rating can change.
Oral-systemic evidence is moving quickly. We will update condition pages as better longitudinal studies, randomized trials, economic analyses and real-world implementation data become available.
Follow updates in The Oral Signal Brief →