Association Between Periodontal Disease and Glycemic Control in Diabetes Mellitus: A Review of Pathophysiology and Clinical Evidence

https://doi.org/10.5281/zenodo.19134183

Abstract

Diabetes mellitus and periodontal disease are closely interrelated chronic conditions with a bidirectional relationship, wherein each can influence the onset, progression, and severity of the other. Diabetes increases susceptibility to periodontitis through mechanisms including hyperglycemia-induced immune dysfunction, oxidative stress, chronic inflammation, and advanced glycation end product (AGE)-RAGE signaling, which impair tissue repair and promote alveolar bone loss. Conversely, periodontal inflammation contributes to systemic inflammatory burden, elevates circulating cytokines such as TNF-α, IL-1β, and IL-6, and exacerbates insulin resistance, thereby impairing glycemic control. This review synthesizes current evidence from recent clinical, epidemiological, and mechanistic studies (2020–2025) to elucidate the molecular and immunological pathways linking these two conditions. We discuss the role of periodontal pathogens, dysbiosis, and host immune responses in mediating tissue destruction and systemic metabolic effects, as well as emerging diagnostic biomarkers in saliva and gingival crevicular fluid for early detection and monitoring. Evidence demonstrates that non-surgical periodontal therapy, including scaling and root planning, with or without adjunctive host-modulatory interventions, can modestly but significantly improve glycemic control, reflected by reductions in HbA1c, and reduce systemic inflammatory mediators. The review also highlights limitations in current research, including heterogeneity in study designs, short follow-up periods, and variability in periodontal definitions, underscoring the need for standardized longitudinal studies. Integrating periodontal care into diabetes management, supported by lifestyle modifications and interdisciplinary collaboration, represents a promising strategy to improve both oral and systemic health outcomes. This review emphasizes the importance of recognizing periodontitis as a modifiable risk factor in diabetes and highlights potential therapeutic and diagnostic advancements that can inform clinical practice and future research.