Published: May 1, 2025
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You can identify a mouth breather from across the room. Forward head posture, elongated face, crowded teeth, recessed chin, dark circles under the eyes... On top of that, mouth breathing starves your brain of oxygen. Here's how to reverse it all: 🧵

Image in tweet by Ben Smith

Your face literally remodels when you breathe through your mouth. Orthodontists can identify mouth breathers in seconds. Their palate becomes high and narrow, teeth crowd together, and the lower face elongates. Within months, their entire facial profile changes.

Image in tweet by Ben Smith

Here's what happens: When your mouth hangs open, the tongue drops from the roof of your mouth. This removes the natural support that shapes your upper jaw. Meanwhile, facial muscles strain in new patterns, gradually pulling your bones into the classic "adenoid face."

Image in tweet by Ben Smith

Mouth breathing can reduce oxygen to your brain by up to 10-18%. This isn't just about feeling tired. Your prefrontal cortex (decision making, focus) literally gets less fuel to function.

Ever notice how mouth breathers often have brain fog or attention issues? When you breathe through your mouth, you disrupt the body's CO2 balance. This constricts blood vessels in the brain, limiting oxygen delivery to brain cells despite normal blood oxygen levels.

Image in tweet by Ben Smith

In addition to this, if you want to stop getting sick all the time- stop being a mouth breather. Dr. Andrew Huberman provides a great explanation of how effective the nasal microbiome is at eliminating bacteria and preventing certain types of infections ↓

Nasal breathing, by contrast, produces nitric oxide. This is a molecule that dilates blood vessels and kills pathogens. This increases oxygen absorption by 10-20% and enhances blood flow to the brain. Mental clarity depends on biology more than it does on psychology.

The metabolic cost of mouth breathing: It triggers a chronic stress response, elevating cortisol and contributing to insulin resistance. Your mitochondria become less efficient, shifting to anaerobic metabolism even at rest.

Image in tweet by Ben Smith

Your nose is a precision instrument with 5 crucial functions: 1. Humidification (prevents dry lungs) 2. Filtration (traps pollutants) 3. Nitric oxide production 4. CO2 regulation 5. Diaphragmatic engagement The mouth evolved for eating, not breathing.

Image in tweet by Ben Smith

When I had IBS, I discovered that breathing pattern affects gut function too. Mouth breathing activates fight-or-flight mode, shutting down digestive function. Nasal breathing activates the rest-and-digest parasympathetic system, improving gut motility and enzyme production.

My protocol to retrain your breathing: 1) Practice conscious nasal breathing during the day 2) Try the 4-7-8 breathing pattern (4s inhale, 7s hold, 8s exhale) ↓ Mouth taping might work, but who the fu*k wants to put a tape on their mouth?

For advanced optimisation, try these techniques: • Box breathing for focus (4s in, 4s hold, 4s out, 4s hold) ↓ • Alternate nostril breathing for balance • Wim Hof method for immune function

How to know if you're making progress? First, note morning energy levels. Check for dry mouth upon waking. Monitor resting heart rate (should decrease). Measure recovery time after exercise And finally, observe changes in facial tension and posture.

I've coached 1500+ people on health optimisation, and breathing pattern correction consistently produces the most dramatic improvements. You started this life with your first inhale. You'll end it with your last exhale. Therefore, breathing is life itself.

To transform your health beyond just better breathing... Join my free 14-day "limitless." program where I'll share the exact protocols that helped 1500+ of my clients overcome everything from brain fog to chronic fatigue. Join here ↓ http://becominglimitless.xyz

Thank you for reading! For more content like this in the future drop a like and follow me @bensmithlive

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