The Night Shift of the Jaw

Bruxism is the unglamorous habit of grinding your teeth, usually while asleep, when the subconscious takes the opportunity to express itself through the jaw.

This condition affects almost 30% of the adult population.

Human beings are remarkably inventive in finding new ways to worry. We no longer spend our nights listening for wolves or rival tribes creeping through the undergrowth. Instead, we lie in centrally heated (or air conditioned) bedrooms, atop mattresses engineered by Scandinavian sleep scientists, and unconsciously attempt to reduce our molars to chalk dust.

Dentists observe this with the particular resignation of those who have chosen a profession based on other people’s bad decisions. Armed with mirrors and polite disapproval, they identify the damage: flattened enamel, tiny fractures, the slow attrition of structure by persistence rather than violence.

“You’ve been grinding,” they say, with the tone of someone discovering a long-kept secret rather than a fairly common human behaviour.

The usual culprits are stress, anxiety, poor sleep, stimulants, alcohol, and the general inconvenience of being alive in the early twenty-first century. Unfortunately, none of these are easily extracted with forceps.

The remedies are no less curious. There are mouthguards – transparent plastic contraptions that transform the sleeper into a retired boxer. These devices can be effective, although not necessarily seductive. Nothing quite extinguishes romance like watching a partner ceremoniously insert industrial-grade acrylic before bed.

Yet bruxism has a certain honesty to it. Even at rest, we do not fully rest. The mind continues its unpaid overtime; the body follows suit, clenching through arguments that were never concluded and worries that were never formally submitted.

Perhaps it is not a disorder so much as background noise: the mechanical hum of a species that has mistaken vigilance for virtue. Sleep, once a blunt instrument of survival, has become a more complicated affair – less surrender than continuation, just with the lights off.

Our ancestors dreamed of mammoths. We dream of overflowing inboxes, passive-aggressive emails and the peculiar dread inspired by a calendar notification. They woke to the possibility of being eaten; we wake with a jaw that feels as though it’s spent the night chewing paving slabs, only to discover that the predator waiting for us is an invoice from the dentist.

In that sense, tooth grinding is less pathology than punctuation – the jaw insisting, against all instruction, on finishing sentences the conscious mind left hanging.

Hal Huggins viewed tooth grinding less as a local nuisance of enamel and more as a systemic complaint masquerading as dentistry. In his telling, bruxism was the body talking back.

A slightly misaligned bite, an ill-fitting crown, a filling that sat too high – these were not trivialities but provocations. The jaw, he suggested, is nothing if not petty: it remembers every mechanical slight and returns the favour at 2am.

He went further, as dissenters tend to. Dental materials – particularly mercury amalgams – were, in his view, capable of unsettling the nervous system, setting off chains of symptoms that might end, quite plausibly, in nocturnal grinding.

Nutrition, biochemistry, general bodily discord all joined the conspiracy. The mouth was not an isolated instrument, but a noisy outpost of the whole organism.

Mainstream dentistry, unimpressed by such symphonic thinking, prefers a more prosaic explanation. Bruxism is now most commonly associated with stress, anxiety, sleep disruption (especially sleep apnoea), certain medications, and neurological factors.

Bite irregularities still get a mention, but more as footnotes than headlines.

So Huggins remains where most medical heretics end up: somewhere between prescient and fanciful, depending on the decade and the audience.

The jaw, meanwhile, continues to grind on, largely indifferent to who is right.