The noise is usually worse than the damage. A child grinding in their sleep can sound like gravel being crushed through the bedroom wall, yet in most children it leaves little more than some flattening on baby teeth that will fall out anyway. Grinding of this kind tends to fade as the adult teeth arrive and the bite settles, and many children never need any treatment for it.
What deserves attention is the company it keeps. Grinding that comes with loud snoring, pauses in breathing, jaw pain or teeth that are visibly wearing down is worth raising with your dentist and GP.
Sleep bruxism is common in childhood
Dentists call night-time grinding and clenching sleep bruxism. Studies report very different figures for how many children do it, partly because most of the information comes from parents who happen to hear it, and a quiet grinder or a child in their own room is easily missed. Across the research it is clearly common, more so in younger children, and reports tend to drop off as children move into their teens.
Most grinding happens in short bursts during lighter stages of sleep. A child usually has no idea they are doing it and is not woken by it.
There is rarely one single cause
Researchers now think of sleep bruxism as something driven mainly by the brain and the sleep cycle rather than by the way the teeth fit together. Several things are linked with it in children, though a link does not always mean cause:
Breathing during sleep. Enlarged tonsils or adenoids, a constantly blocked nose and mouth breathing are associated with grinding. This is the most important link to look for, because sleep-disordered breathing affects sleep quality, behaviour and growth, and it is treatable.
Sleep quality and arousal. Overtiredness, irregular bedtimes and frequent brief arousals from sleep are associated with more grinding episodes.
Stress and temperament. Worry, excitement and changes such as starting school can be part of the picture for some children.
Medications and other conditions. Some medicines, including certain stimulants used for ADHD, and some developmental and neurological conditions are associated with grinding. If your child takes regular medication, mention it to your dentist.
The changing mix of baby and adult teeth is often blamed, and while the bite is certainly in flux between about six and twelve, the evidence that bite problems cause grinding is weak. Grinding the teeth down to make the bite fit better is not a treatment for it.
Signs that it is doing more than making noise
A dentist or OHT checks for wear at routine visits. In children the signs worth acting on include:
- baby or adult teeth that look noticeably flat, short or chipped, especially adult teeth
- sensitivity to cold or pain when chewing
- jaw ache, tight jaw muscles or headaches in the morning
- snoring most nights, gasping or pauses in breathing, very restless sleep
- daytime tiredness, poor concentration or behaviour changes that may point to poor sleep
Jaw pain is less common in children than in adults, but if it is there, our article on jaw pain and the TMJ explains the joint and muscles involved.
Night guards are not a routine answer for children
For adults who grind heavily, a custom-made night guard is a standard way to protect the teeth. Children are different. Their jaws are growing and teeth are erupting and falling out, so a guard can stop fitting within months and may get in the way of teeth coming through. A guard also does nothing to address the reason a child is grinding.
For that reason most children are simply monitored. Where an older child has significant wear on adult teeth, a dentist may suggest a soft, custom-fitted guard, checked and remade regularly as the mouth changes. Shop-bought boil-and-bite guards are not a good idea for children. Our guide to night guards covers the adult options if you want to compare.
Practical steps at home
A regular, unhurried bedtime routine helps sleep quality, which in turn may reduce grinding. Screens off well before bed, a consistent sleep time and avoiding caffeine (including cola and iced tea) in the afternoon all count. If your child snores, breathes through their mouth or has a constantly blocked nose, see your GP, as treating that is useful in its own right.
Good brushing technique and fluoride toothpaste matter here too. Worn enamel, especially on adult teeth, is less able to cope with acid, so cutting back on fizzy drinks and sipping juice through the day reduces the combined effect of grinding and erosion.
What parents often ask
At what age does it usually stop?
There is no fixed age. Grinding tends to become less frequent through later primary school and into the teens, but some children continue, and a smaller number carry it into adulthood.
Should I wake my child when I hear it?
No. Waking them breaks up their sleep and does not stop the grinding. A note of how often you hear it and whether there is snoring is more useful to your dentist.
Is it a sign of worms?
This is an old belief. Studies looking for a link with intestinal worms have given mixed results, so grinding on its own is not a reliable sign that a child has worms.
Having it checked
If grinding is new, heavy or comes with any of the signs above, a check-up lets the dentist look at wear on the teeth, the jaw muscles and the developing bite, and point you to your GP if breathing during sleep needs a closer look. Our oral health therapists see children and families and focus on prevention. If it is your child's first appointment, our first visit guide explains what happens, and our current offers are listed online.
This article is general information and not a substitute for an individual dental assessment.
