Alzheimer's & Dementia

Tooth Loss Tracks With Blood Markers of Neurodegeneration

Qi X, Liu R, Belsky DW

Source study: Edentulism, blood-based neurodegenerative biomarkers, and 10-year dementia risk: A mediation analysis in a nationally representative United States cohort. — Alzheimer's & Dementia

In brief

  • In 4,238 US adults 50+, edentulism predicted a 49% higher risk of cognitive impairment and 28% higher risk of dementia over 10 years
  • Edentulism was associated with higher NfL and GFAP (markers of neuronal/glial injury), not with amyloid or tau markers
  • GFAP mediated 10-12% of the edentulism-cognition association
  • Associative findings only — they do not establish causality, but support further research on oral health in dementia prevention

Clinical question: does tooth loss (edentulism) predict cognitive decline and dementia, and is this association mediated by blood-based markers of neurodegeneration?

Methodology: 4,238 participants aged 50+ from the nationally representative US Health and Retirement Study (HRS). Edentulism status was recorded in 2012, blood biomarkers — neurofilament light chain (NfL), glial fibrillary acidic protein (GFAP), phosphorylated tau-181, and amyloid-β 42/40 — were measured in 2016, and cognitive outcomes were tracked from 2012 to 2022. Mediation analysis tested how much of the edentulism-cognition link the biomarkers explained.

Findings: edentulism was associated with higher NfL and GFAP, but not with pTau-181 or amyloid-β, and predicted a 49% higher risk of cognitive impairment (HR 1.49) and a 28% higher risk of dementia (HR 1.28) over 10 years. GFAP mediated 9.8% of the cognitive impairment association and 12.0% of the dementia association; NfL mediated 9.8% of the dementia association only.

Clinical relevance: this is an observational, associative finding — it does not establish that tooth loss causes dementia. But it strengthens the case for tooth retention and prosthetic rehabilitation as part of a broader conversation about healthy ageing, and gives periodontists and prosthodontists a concrete data point to share with physicians managing at-risk patients.

Why it matters in practice

In this 10-year US cohort, edentulism predicted a 28-49% higher risk of cognitive impairment and dementia, partly explained by elevated blood biomarkers of neural injury — a reason to flag tooth loss as a signal worth discussing in shared care with physicians.

This summary is automatically generated from the original abstract and curated by Dr. Ernesto Bruschi. Always refer to the original publication for clinical decisions.
Read original article ↗View on PubMed ↗

Related articles