Consciously slowing your jaw and tongue while breathing can genuinely relax those areas — but nothing shows it sends a 'safety signal' to the vagus nerve that regulates the rest of your nervous system.

noli's read

The idea that relaxing your jaw and tongue 'communicates with the nervous system' implicitly leans on polyvagal theory (Stephen Porges), which proposes a 'safety neuroception' mechanism through specific vagal pathways. That theory is now actively disputed: a 2025-2026 paper co-authored by 39 named experts in vagal physiology and vertebrate evolution — several of whom were previously cited as supporting evidence for the theory — concludes its core neuroanatomical and evolutionary claims are 'not defensible based on existing neurophysiological and evolutionary evidence.' Genuine vagal-stimulation exercises do exist in the clinical literature — for instance, transcutaneous auricular vagus nerve stimulation, which showed reduced jaw-muscle activity and anxiety in a double-blind trial — but those are precise electrical protocols, not gently moving your tongue and jaw. It's plausible that relaxing your jaw and tongue brings real local muscle release and a general calming effect, but the specific claim of a 'signal sent to the vagus nerve' has no direct evidence behind it. Verdict: unproven — the gesture may well relax you, but the vagal mechanism invoked rests on a theoretical framework now challenged by a large, named expert consensus.

the sources

No named source held this one up — that absence is part of the verdict.