Bruxism & Clenching

What bruxism actually is — and why 'asleep' and 'awake' are different problems

Bruxism is the umbrella term for clenching or grinding your teeth, or bracing and thrusting your jaw without tooth contact. The international consensus definition splits it into two distinct behaviours: sleep bruxism, which happens during sleep and is largely driven by brief arousals in the brain, and awake bruxism, which is sustained tooth contact or jaw bracing during the day, usually tied to concentration, stress or habit. Importantly, the same consensus is clear that in otherwise healthy people bruxism is a behaviour, not a disease — it only matters when it starts causing consequences, such as muscle pain or tooth damage.

The distinction is practical, not academic. Sleep bruxism happens below conscious control, so willpower alone can't switch it off — management focuses on protecting the teeth, settling the overworked muscles and addressing sleep-related drivers. Awake bruxism is a habit you can genuinely retrain once you learn to notice it. Most people with jaw muscle pain have some of both.

How it shows up

The jaw-closing muscles — masseter at the angle of the jaw, temporalis at the temple, and the deeper pterygoids — are built for chewing in short bursts, not for hours of low-grade contraction. When bruxism keeps them switched on, they respond the way any overworked muscle does: they ache, stiffen and develop tender points that can refer pain into the face, teeth and head.

• Morning symptoms: jaw ache, stiffness or temple headaches on waking are the classic signature of sleep bruxism, because the muscles have been working overnight
• Fatigue on chewing: tiring quickly on a chewy meal, or avoiding steak and crusty bread, suggests muscles running near capacity
• Tooth signs: flattening, chips, cracks and sensitivity — usually your dentist spots these before you do
• Muscle bulk and tightness: a firm, sometimes visibly squarer masseter that is tender when pressed
• Day-time tells: catching your teeth touching while emailing, driving or lifting weights — at rest, teeth should sit slightly apart

What drives it

There is rarely a single cause. Stress and anxiety are the most consistently reported contributors — the NHS lists them as the most common — and awake clenching in particular tracks closely with concentration and pressure. Sleep bruxism is linked to micro-arousals during sleep, which is why anything that fragments sleep can feed it. That includes obstructive sleep apnoea: research consistently finds bruxism is common in people with sleep apnoea, although whether one causes the other is still genuinely unsettled. If you snore heavily, wake unrefreshed or your partner notices pauses in your breathing, that's worth a conversation with your GP — for your general health, not just your jaw.

Caffeine, alcohol and smoking are each associated with more grinding, and some prescribed medicines — including certain antidepressants such as SSRIs, and some ADHD medications — can increase bruxism as a side effect. If you suspect a medication link, please don't stop or change anything yourself; mention it to your GP or prescriber, who can weigh it properly. Genetics play a part too — bruxism runs in families — which is a useful reminder that this is not a character flaw or something you're doing wrong.

Why the splint didn't fix your pain

This is the conversation we have most often. Your dentist was right to make you a night guard: it is the standard, sensible way to protect enamel and dental work from grinding forces, and dentists are exactly the right people to manage that side. But a guard is armour for the teeth, not a treatment for the muscles. Many people continue clenching against the splint — the masseter and temporalis keep contracting all night, just against acrylic instead of enamel. The US National Institute of Dental and Craniofacial Research is candid that there is not strong evidence oral appliances improve jaw pain itself.

So if your teeth are now safe but your face still aches in the morning, nothing has gone wrong and nobody has failed you. The tooth problem and the muscle problem are two different problems, and it usually takes two different approaches — your dentist for one, muscle-focused treatment for the other — working alongside each other.

Treating the muscular side: what we do at the clinic

At Jaw-Pain.ie, Eli Fagan (Manual Therapy Practitioner) leads all jaw cases hands-on, supported by physiotherapist Kate Ryan. The first appointment is a 60-minute assessment: we map which muscles are overloaded, how your neck is contributing, what your grinding pattern looks like (asleep, awake or both), and what's driving it — then agree a realistic plan.

Treatment itself is unglamorous and practical. Intra-oral release means working directly on the masseter, temporalis and pterygoid muscles from inside the mouth (gloved, careful, and firmer than comfortable but never brutal) — these muscles simply can't be reached properly from outside. We treat the neck as well, because the upper neck and jaw share wiring and posture patterns, and a stiff, guarded neck keeps feeding jaw tension. And we coach habit retraining for the daytime component: building awareness of when your teeth touch, and a simple 'lips together, teeth apart' reset practised until it becomes automatic. You leave with a short home routine, because what you do between sessions matters more than what we do in them.

Honesty about limits: we cannot switch off sleep bruxism — nobody can, reliably. What manual treatment and retraining can realistically do is reduce the muscle pain, headaches and chewing fatigue that bruxism causes, and shrink the daytime clenching that adds to the load. For most people that's the difference that matters.

Self-help that actually helps

None of this replaces assessment, but these are the low-risk habits we ask almost every bruxism patient to build.

• Check your resting position hourly at first: lips together, teeth apart, tongue resting gently on the roof of the mouth — set phone reminders until noticing becomes automatic
• Heat on the masseter and temple for ten minutes in the evening eases muscle tone; some people prefer cold for flare-ups — use whichever settles yours
• Trim caffeine, especially after midday, and notice whether alcohol-heavy evenings produce worse mornings
• Protect your sleep: regular hours, a wind-down routine, and treat snoring or unrefreshing sleep as something to raise with your GP rather than ignore
• Avoid marathon chewing — gum, pen-biting, nail-biting — while symptoms are active; the muscles need less work, not more
• Keep wearing the night guard your dentist made; it's doing its job for your teeth even while we handle the muscles

When to involve your dentist or GP

We deliberately work alongside dentists and GPs rather than instead of them. See your dentist promptly if you notice chipped, cracked, loose or newly sensitive teeth, or if your night guard is worn through — protecting teeth and managing splints is their domain, and grinding damage is cheaper to fix early. See your GP if you have signs of sleep apnoea (loud snoring, witnessed pauses in breathing, waking unrefreshed, daytime sleepiness), if you think a medication may be contributing, or if stress and anxiety feel bigger than jaw-deep — talking therapies and stress management address the driver, not just the symptom. And if jaw pain comes with fever, swelling, inability to open or close the mouth, or follows trauma, seek medical or dental care first. You don't need any referral to see us in Ireland — but if your case needs a dentist or doctor first, we'll say so plainly at assessment.

Grinding or clenching — and the night guard hasn't touched the pain? Call (01) 263 4379 or book a 60-minute assessment (€75) with Eli Fagan in Monkstown. No referral needed.

Sources

• Teeth grinding (bruxism) — NHS
• Bruxism — National Institute of Dental and Craniofacial Research (NIDCR)
• TMD (Temporomandibular Disorders) — National Institute of Dental and Craniofacial Research (NIDCR)
• Bruxism Management — StatPearls — NCBI Bookshelf, National Library of Medicine
• International consensus on the assessment of bruxism: Report of a work in progress (Lobbezoo et al., Journal of Oral Rehabilitation, 2018) — PubMed Central
• Relationship Between Bruxism and Obstructive Sleep Apnea: A Systematic Review of the Literature (Journal of Clinical Medicine, 2025) — PubMed Central