A child grinding in their sleep can sound alarming from the hallway, yet in most cases the noise is far worse than anything it does to the teeth. Grinding is common through the preschool and primary school years, and many children ease off by themselves as the adult teeth settle into place. A dental check is worth booking when you see wear, hear complaints of pain, or notice the child is sleeping poorly.
The sound is usually worse than the wear
Baby teeth are small and the enamel is thinner than on adult teeth, so some flattening of the biting edges is normal by the time they loosen. Light grinding tends to add a little to that wear without causing harm, and those teeth are shed anyway. Children are also often unaware that they grind, so many are not bothered by it.
Studies report very different figures for how many children grind, partly because most rely on parents hearing it. What they agree on is that it is common and tends to become less common with age. For that reason dentists usually start by watching and recording the wear at each visit rather than treating straight away.
What tends to sit behind it
There is rarely one cause. An umbrella review of the research on sleep grinding in children (Scarpini and colleagues, Brazilian Oral Research, 2023) found the factors most often linked with it were sleep duration and quality, breathing problems during sleep, and personality and psychosocial factors such as worry. In everyday terms, that means a child who sleeps poorly, snores or breathes through the mouth, or is going through a stressful patch such as starting school, may be more likely to grind. The same review found there is not yet enough good evidence to recommend any specific treatment, which is another reason dentists tend to watch and address likely triggers first.
Signs that mean it is time for a check
Occasional grinding in a child who sleeps well, has no pain and eats normally can usually wait until the next routine visit. Book sooner if you notice:
- teeth that look noticeably shorter, chipped or flat on top
- sensitivity when eating or drinking something cold
- complaints of a sore jaw, ear pain or headaches on waking
- loud snoring, pauses in breathing, or a child who is tired and unsettled during the day
- grinding that is getting louder or more frequent with the adult teeth already in
Why a night guard is rarely the first answer
For adults who grind, a custom guard is a common way to protect the teeth, as our article on bruxism in adults explains. Children are different. A guard made for a mouth that is still losing and gaining teeth soon stops fitting as teeth come and go. Guards are generally kept for older children and teenagers whose adult teeth show real wear, and even then they are reviewed often.
For younger children, care is more about the likely trigger: a settled bedtime routine with less screen time beforehand, attention to any worry the child is carrying, and regular checks to see whether the wear is changing.
Snoring changes the conversation
When grinding comes with snoring or noisy, open mouth breathing, the sleep itself may need looking at. In children, enlarged tonsils and adenoids are among the most common causes of obstructed breathing during sleep (Vaienti and colleagues, Frontiers in Neurology, 2024), and this is something a GP can assess and refer on if needed. Our guide to snoring and sleep apnoea covers the warning signs. The dentist can flag these signs, but the diagnosis of a sleep problem sits with the medical team.
Questions parents often ask
Should I wake my child when I hear it?
There is no need, and waking them simply breaks their sleep. Note how often it happens and bring it up at the next appointment.
When do most children stop?
It varies a lot from child to child, and many ease off as they get older. Grinding that continues into the teenage years with visible wear is worth a closer look.
Will it damage the adult teeth?
Light grinding usually does not. Heavier grinding that carries on after the adult teeth arrive can wear them, which is why the dentist keeps track over time.
If your child has never been to the dentist, our article on a child's first dental visit describes what happens. To have a dentist or OHT check for wear, book with our general dentistry team at Lumi Dental in Melrose Park, and see current offers for families.
