Background: Edentulism adversely affects mastication, speech, nutrition, and psychosocial well-being. Emerging evidence indicates potential links between oral dysfunction, hearing impairment, and cognitive decline. Implant-retained overdentures (IODs) enhance functional rehabilitation and may influence sensoryneural outcomes. Objective: To systematically map current evidence on the effects of IODs on auditory and cognitive functions in edentulous individuals. Methods: A scoping review was conducted in accordance with PRISMA-ScR guidelines. Peer-reviewed studies (2015–2025) reporting auditory and/or cognitive outcomes following IOD rehabilitation in adults were included. Results: Evidence suggests that IODs can improve bone-conduction sound transmission and enhance cortical activation through masticatory stimulation, supporting neuroplasticity. However, current studies are limited in number and methodological rigour. Conclusion: Implant-retained overdentures may contribute to improved sensoryneural health beyond oral rehabilitation. High-quality multicenter clinical trials are required to substantiate their auditory and cognitive benefits.