Concomitant Hypodontia and Hyperdontia (CHH): Clinical Challenges and Public Health Strategic Importance in Saudi Arabia

Concomitant hypodontia and hyperdontia (CHH), or "hypo-hyperdontia", represents a rare numerical dental anomaly in which a patient simultaneously presents with congenitally missing teeth and supernumerary elements.This narrative review examines the genetic and molecular mechanisms underlying CHH, focusing on the dual disruption hypothesis of dental lamina development, alongside global epidemiological data and reported male predominance.Clinical presentation, radiographic diagnosis, and multidisciplinary management strategies -encompassing surgical, orthodontic, and restorative interventions -are critically evaluated.A structured clinical decision-making framework and age-specific management pathways are proposed to guide practitioners.The psychosocial implications of CHH, particularly in adolescents, are discussed.The Saudi Arabian healthcare context is briefly addressed as a case example of integrating rare dental anomaly management into a transforming primary care system.This review acknowledges its narrative design and the limitations of the current evidence base and highlights critical gaps requiring future epidemiological and clinical research.