Alzheimer's Disease and Oral Health from Clinical Challenges to Interdisciplinary Care: A Narrative Review.

The link between oral health and Alzheimer's disease (AD) has gained increasing attention in recent years. Emerging evidence suggests that this association is bidirectional, involving both biological mechanisms and behavioral consequences that reinforce one another over time. Literature Review: A narrative synthesis of systematic reviews, meta-analyses, and scoping reviews published between January 2010 and March 2024 was conducted. Searching was performed in four electronic databases (PubMed, Scopus, the Web of Science, and the Cochrane Library), using a combination of MeSH terms and free-text keywords related to dementia and oral health. Inclusion criteria targeted human studies published in English with full-text access and a clear focus on the interplay between oral status and Alzheimer's disease. Results: The reviewed literature indicates that periodontal disease, tooth loss, and oral microbiome alterations may contribute to neuroinflammation and cognitive decline, potentially influencing the onset and progression of AD. Conversely, Alzheimer's disease negatively affects oral health through impaired self-care, reduced motor coordination, salivary changes, and altered pain perception. Conclusions: By mapping out these interconnections, the findings support a shift in perspective; oral health should be considered a relevant factor in both the prevention and management of Alzheimer's disease. Dentistry and neurology must move closer together in clinical practice, particularly in the care of older adults. Promoting oral health is not just about preserving teeth; it may be part of preserving cognitive function and quality of life.