Abstract

Diabetes mellitus is a chronic metabolic disorder with wide-ranging systemic consequences, including profound 
effects on oral health. Accumulating evidence demonstrates a bidirectional relationship between diabetes and oral 
diseases, particularly periodontal disease, whereby poor glycaemic control exacerbates oral pathology and chronic 
oral inflammation adversely affects metabolic regulation. This review synthesizes current evidence on the 
epidemiology, mechanisms, and clinical implications of diabetes-related oral health complications. It examines the 
spectrum of oral manifestations associated with diabetes, including periodontal disease, gingival and periodontal 
infections, xerostomia, dental caries, altered oral microbiota, microvascular dysfunction, and impaired wound 
healing. Key pathophysiological mechanisms such as hyperglycaemia-induced immune dysregulation, advanced 
glycation end-product accumulation, oxidative stress, inflammatory cytokine networks, and vascular impairment 
are explored to elucidate the biological basis of these associations. The review further highlights the impact of 
periodontal disease and its treatment on glycaemic control, underscoring the clinical relevance of oral health in 
diabetes management. Special populations, including children, adolescents, and pregnant individuals, are discussed 
alongside public health, health literacy, and access-to-care considerations. Finally, the paper emphasizes the need 
for integrated medical-dental care models, routine oral health screening in diabetes care, and interprofessional 
collaboration. Addressing oral health as an integral component of diabetes management is essential for improving 
clinical outcomes, reducing systemic inflammation, and enhancing overall quality of life.