Common Systemic Medical Conditions and Their Effects on Oral Health: A Review and Practical Guide for Medical and Dental Practitioners

Author

Dr. Althaaf Khan

Abstract

 Background: Oral health is an integral component of general health, and the relationship between the two is bidirectional. Many conditions encountered daily in medical and dental practice, including diabetes mellitus, cardiovascular disease, respiratory disease, chronic kidney disease, HIV infection and mental illness, influence the oral cavity directly through disease processes and indirectly through the medications used to treat them.

Objective: To review the effects of common systemic medical conditions on oral health and to provide a practical, evidence-informed guide for doctors and dentists.

Methods: A narrative review was undertaken of literature published between 2000 and 2025 in PubMed/MEDLINE, Scopus and the Cochrane Library, prioritising systematic reviews, meta-analyses, consensus reports and clinical guidelines.

Results: The evidence is strongest for the bidirectional relationship between diabetes and periodontitis, the association of periodontitis with hypertension and cardiovascular disease, the oral manifestations of HIV infection, the role of reflux and eating disorders in erosive tooth wear, and the high burden of oral disease in people with severe mental illness. Medication-induced xerostomia, gingival overgrowth and medication-related osteonecrosis of the jaw are important and often preventable iatrogenic oral complications.

Conclusion: Systemic conditions and their treatment shape oral health risk, and oral disease can in turn complicate systemic disease control. Routine medical history review, risk-based preventive care, and timely interprofessional communication can reduce preventable harm. Oral examination should be regarded as part of comprehensive chronic disease care.

Keywords

oral health; systemic disease; periodontitis; xerostomia; medication-related adverse effects; interprofessional care

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