13/02/2026
Research published in Neurology shows a concerning link between gum disease, tooth loss, and accelerated brain shrinkage, particularly in the hippocampus—the region responsible for memory and learning.
In older adults, gum disease combined with missing teeth was associated with faster shrinkage of the left hippocampus. In cases of mild periodontal disease, losing even one tooth was linked to brain volume loss comparable to nearly one year of aging. Interestingly, in severe periodontitis, retaining multiple infected teeth appeared more harmful than removing them, suggesting that chronic untreated oral infection may have systemic consequences.
The mechanism is biologically plausible. Long-term periodontal inflammation allows bacteria such as Porphyromonas gingivalis to enter the bloodstream. These pathogens and their inflammatory byproducts may contribute to neuroinflammation, vascular changes, and neuronal damage.
Tooth loss may also reduce chewing stimulation and affect nutrition—both critical for cognitive health.
The takeaway is clear: periodontal treatment, infection control, and preserving functional teeth are part of brain health prevention strategies. Oral health is systemic health.
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📄 Source: Yamaguchi, S., Murakami, T., Satoh, M., Komiyama, T., et al. (2023). Associations of dental health with the progression of hippocampal atrophy in community-dwelling individuals: The Ohasama Study. Neurology, 101(10), e1056–e1068.
