Clenching, Grinding, Jaw Pain, Bruxism: When the problem is in the Nervous System

Bruxism — chronic teeth grinding and jaw clenching — is not simply a dental habit. For many people, particularly those with a history of stress, trauma, or physical injury, it is the body's nervous system expressing a state it cannot find its way out of. Addressing the jaw alone rarely resolves it.

Written by Monica Williams Naturopath | Advanced FSM Practitioner | IICT Member | 30

years in clinical practice | Maroochydore, Sunshine Coast QLD

In short: 

This article covers what drives chronic bruxism beyond the teeth, why it is so common in people with a trauma history, and how working with the nervous system and underlying tissue injury may support recovery.

Key Takeaways

• Bruxism is strongly associated with nervous system hyperarousal — the body staying in a state of alert even when the threat has passed

• Research confirms a significant link between PTSD and both awake and sleep bruxism, with trauma-focused treatment shown to reduce bruxism severity [1]

• Physical trauma to the neck and surrounding structures can affect vagal tone and the trigeminal nerve pathway, contributing to chronic jaw tension

• Treatments that address only the jaw — splints, botox, dental adjustment — do not address the nervous system root

• In clinical practice, clients have experienced meaningful improvement in jaw pain, sleep, and function following FSM therapy addressing both the nervous system and underlying tissue injury

1. What Bruxism Actually Is

Bruxism is repetitive jaw muscle activity — most commonly teeth grinding or clenching — that occurs during sleep, during waking hours, or both. For some people it is a mild habit. For others it becomes a genuinely debilitating condition.

Severe bruxism can cause:

• Waking pain in the jaw, face, temples, or neck

• Headaches, particularly on rising

• Disrupted sleep — either difficulty staying asleep or waking in pain

• Worn, cracked, or damaged teeth

• Difficulty opening the mouth fully

• Pain on chewing, sometimes severe enough to limit what foods can be eaten

• Referred pain into the ear, neck, and shoulders

Standard management includes bite splints, botox injections to the masseter muscle, dental adjustment, and stress management. These approaches can provide relief — but for many people, particularly those whose bruxism has a deeper root, the relief is partial and temporary. Botox needs to be repeated. Splints protect the teeth but do not address the clenching. The jaw keeps going because the signal driving it has never been turned off.

2. The Nervous System Connection to Bruxism

The jaw is one of the most tension-sensitive areas of the body. Clenching is a primal protective response — part of the fight-or-flight reflex that braces the body for threat. When the nervous system is chronically activated, the jaw often follows.

Research increasingly confirms what many clinicians observe: bruxism is a biopsychosocial condition rooted in nervous system dysregulation. People with hyperarousal — a nervous system that cannot fully stand down — grind and clench because the body is still bracing. Stress hormones stay elevated. Muscle tone stays high. The jaw reflects the state of the whole system.

The trigeminal nerve, which controls sensation and movement in the jaw and face, has strong neural connections to the brain regions that process stress and threat. [2] When those regions are chronically active, the trigeminal system reflects it — in tension, pain, and bruxism.

The vagus nerve compounds this further. Poor vagal tone — reduced parasympathetic activity — keeps the body in sympathetic dominance: alert, tense, and unable to settle. Research has shown that vagal stimulation reduces jaw pain and dysfunction in people with temporomandibular disorders, highlighting the direct relationship between vagal tone and jaw muscle behaviour. [3]

Professional Insight — Monica Williams, Naturopath & Advanced FSM Practitioner (IICT): Bruxism that doesn't respond to splints or botox is almost always telling us something about the nervous system state. In my clinical experience, when we address the underlying nervous system drivers — including any history of physical trauma to the neck and surrounding structures — jaw tension reduces in a way that symptom management alone cannot achieve. The jaw stops clenching when the body finally gets the signal that it is safe.

3. The Trauma and Physical Injury Connection to Bruxism

Research confirms a significant association between PTSD and bruxism. A 2022 study found that PTSD patients were more than three times as likely to report awake bruxism compared to controls. [4] A 2024 study went further — finding that trauma-focused treatment reduced bruxism severity directly, demonstrating that resolving the underlying trauma changes jaw behaviour. [1]

But the connection is not only psychological. Physical trauma — particularly injury to the neck and surrounding structures — can contribute to bruxism through a distinct biological pathway.

The vagus nerve runs through the neck and is closely associated with the surrounding soft tissues, fascia, and musculature. Physical trauma to the neck region can cause local inflammation, scar tissue, and traction injury to the vagus — impairing its function and reducing parasympathetic tone. With the vagus compromised, the nervous system has less capacity to regulate itself. The body stays in a heightened state. The jaw stays tight.

Old bruising, chronic inflammation, and fascial restriction in the neck and throat region can maintain this state long after the original injury has healed — because the tissue injury itself continues to signal the nervous system that something is wrong.

In clinical practice, clients presenting with severe bruxism in the context of physical trauma to the neck have shown meaningful improvement when treatment addressed both the tissue injury and the nervous system state — not the jaw in isolation.

4. Why Botox Isn't Enough

Botox injections into the masseter muscle are increasingly common for bruxism management, and they can be effective at reducing the mechanical force of clenching. For many people they provide real relief. But botox relaxes the muscle. It does not change the signal driving the muscle.

For people whose bruxism is rooted in chronic nervous system hyperarousal, trauma, or unresolved tissue injury, the need for repeated injections reflects an underlying state that hasn't shifted. The jaw returns to clenching because the nervous system driving it hasn't changed.

This doesn't mean botox has no place — it can be a useful part of a broader approach. But for clients who are cycling through repeated injections without lasting improvement, it is worth asking what else is contributing.

5. When This May Be Relevant to You

This approach may be worth exploring if:

• You experience chronic jaw clenching or grinding that hasn't fully resolved with dental treatment

• You have a history of trauma, PTSD, or prolonged stress

• You have had physical injury to the neck, throat, or surrounding structures

• Your bruxism is accompanied by neck pain, headaches, or other nervous system symptoms

• Botox or splint therapy has provided only partial or temporary relief

• You also experience poor sleep, fatigue, or difficulty fully relaxing

• You notice your jaw clenching worsens under stress or after difficult periods

6. How FSM Therapy May Support Recovery

Frequency Specific Microcurrent (FSM) therapy uses gentle, sub-sensory electrical currents paired with specific frequencies to support the body's own repair and regulatory processes.

In the context of bruxism and jaw pain, the approach addresses multiple layers:

• Nervous system regulation — frequencies targeting the midbrain and limbic system may help reduce chronic hyperarousal, supporting the body's capacity to move out of the bracing, clenching state.

• Vagal tone support — the vagus nerve plays a central role in shifting the body from sympathetic (alert, tense) to parasympathetic (settled, restorative). Supporting vagal function directly addresses one of the key drivers of chronic jaw tension.

• Old tissue injury — inflammation, bruising, and scar tissue in the neck and surrounding structures can be addressed with specific frequency combinations, removing the ongoing tissue signals that keep the nervous system activated.

• Nerve inflammation — the trigeminal nerve pathway, when chronically inflamed or sensitised, contributes directly to jaw pain and muscle hyperactivity. Reducing nerve inflammation supports the jaw to release.

• Local jaw and muscle tissue — inflammation in the masseter, temporalis, and surrounding musculature is addressed alongside the systemic and nervous system work.

Sessions are 90–120 minutes and are deeply calming for most clients. The work is gentle, non-invasive, and works with the body rather than against it. For more on what to expect, the FSM FAQ is a useful starting point.

Frequently Asked Questions

Is FSM therapy for bruxism available in Queensland, Australia?

Yes. Healthier by Choice is located in Maroochydore on the Sunshine Coast, Queensland, and sees clients from across South East Queensland including Brisbane, the Sunshine Coast, and the Noosa region. A free 15-minute phone consultation is available to discuss your situation and whether this approach may be appropriate.

How is FSM different from other treatments for bruxism?

Conventional bruxism treatments — splints, botox, dental adjustment — work at the level of the jaw itself. FSM works with the nervous system drivers and tissue biology that are keeping the jaw clenched. For people whose bruxism has a nervous system, trauma, or physical injury component, this distinction matters significantly. FSM is non-invasive, sub-sensory, and used alongside naturopathic support. You can read more about what an FSM session involves on the About FSM page.

Can trauma really cause bruxism?

Yes — research confirms a strong association. People with PTSD are significantly more likely to report both awake and sleep bruxism, and trauma-focused treatment has been shown to reduce bruxism severity directly. [1][4] Physical trauma to the neck and surrounding structures can additionally affect vagal tone and trigeminal nerve function, contributing to chronic jaw tension through a biological pathway that is separate from the psychological one.

Will FSM work alongside my existing treatments?

In most cases, yes. FSM is designed to complement rather than replace other healthcare. If you are currently using a splint, receiving botox, or working with a psychologist or other practitioner, FSM can be integrated into that care. Monica works collaboratively with a client's broader healthcare team where relevant.

How many sessions would I need?

This depends on how long the bruxism has been present, the underlying drivers, and your overall nervous system state. Most clients begin with a series of 4–8 sessions and reassess from there. Where trauma or physical injury is part of the picture, the process is generally gradual — the nervous system needs time to establish a new resting state. Lasting change is the goal, not temporary relief.

Do you see interstate clients for FSM?

Yes. Clients will often come and stay in Maroochyodre, Cotton Tree, or Mooloolabah and combine treatments with a nice mini break on the Sunshine Coast. Treatments can be received daily or every second day in a treatment bundle. Because FSM treatments are treating at the causative level, the effect of treatment unfolds over the subsequent month, with improvements being felt both immediately, and improving over time.

Ready to Talk?

If jaw pain, teeth grinding, or disrupted sleep has become part of daily life — and what you've tried so far hasn't been enough — a conversation is a good place to start.

Email us to book your free 15-minute discovery call

Your jaw shouldn't be the hardest working part of your body.

About the Author Monica Williams is a naturopath and Advanced FSM practitioner with over 30 years of clinical experience. A member of the International Institute for Complementary Therapists (IICT), Monica completed advanced training in Frequency Specific Microcurrent through the Frequency Specific Seminars programme founded by Dr Carolyn McMakin. She works with people navigating complex and chronic health conditions at her Maroochydore clinic on the Sunshine Coast, Queensland.

References

[1] Knibbe MA et al. The effects of trauma-focused treatment on painful temporomandibular disorders, awake bruxism and sleep bruxism in patients with severe post-traumatic stress disorder. Journal of Oral Rehabilitation. 2024. View article

[2] Chung JW et al. Network Analysis of Temporomandibular Disorder Pain and Subject-Based Bruxism in Post-Traumatic Stress Disorder Patients. Journal of Oral Rehabilitation. 2025. View article

[3] Transcutaneous auricular vagus nerve stimulation for temporomandibular disorders. PMC. 2024. View article

[4] Lobbezoo F et al. Prevalence of painful temporomandibular disorders, awake bruxism and sleep bruxism among patients with severe post-traumatic stress disorder. PubMed. 2022. View on PubMed

[5] McMakin CR, Gregory WM, Phillips TM. Cytokine changes with microcurrent treatment of fibromyalgia associated with cervical spine trauma. Journal of Bodywork and Movement Therapies. 2005;9(3):169–176. View abstract

The content in this article is provided for general educational information and is not a substitute for personalised medical or mental health advice, diagnosis, or treatment. Please consult your healthcare provider regarding your individual health needs.