Gut–Brain–Jaw Axis: The Emerging Role of Gut Microbiota in Temporomandibular Disorders and Orofacial Pain—A Narrative Review

Jan 27, 2026Journal of oral rehabilitation

How Gut Microbes May Influence Jaw Disorders and Face Pain

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Abstract

Recent studies reveal causal associations between specific bacterial genera and temporomandibular disorder (TMD) risk.

  • Gut dysbiosis may worsen inflammation in the temporomandibular joint and increase neuroinflammatory responses.
  • Restoring microbial balance through probiotics or fecal microbiota transplantation could reduce pain hypersensitivity.
  • Microbial metabolites like short-chain fatty acids, GABA, and serotonin are associated with modulation of trigeminal pain pathways.
  • Evidence supports a bidirectional communication system between the gut, brain, and jaw that influences pain mechanisms.
  • Microbiome-targeted strategies, including dietary changes and probiotics, may improve TMD management.

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