Children and TMJ: Early Warning Signs Parents Should Know
TMJ Disorder Doesn't Only Affect Adults
When most people think of TMJ disorder, they picture stressed adults grinding their teeth at night. What many parents don't realise is that children and teenagers can develop jaw joint problems too — and in many cases, the signs are present years before a formal diagnosis is ever made.
At Dr Gray Dentistry in Durban, Dr Gray sees patients across a wide age range, and one of the most important messages for parents is this: jaw and airway problems in children are far easier to address when caught early. The window of opportunity during childhood — when the jaw and face are still actively developing — is something that simply doesn't exist in adults.
Why Children Develop TMJ Problems
Children's jaw problems typically have different root causes than those seen in adults. The most common drivers include:
Mouth breathing This is arguably the most significant and most overlooked cause of jaw development problems in children. When a child breathes through their mouth rather than their nose — due to enlarged tonsils or adenoids, allergies, a narrow airway, or simply a learned habit — the development of the jaw and face is directly affected.
Nasal breathing creates natural pressure inside the mouth that helps shape the upper jaw (palate) as it grows. Mouth breathing removes this pressure, leading to a narrower, higher palate, a more recessed lower jaw, and crowded teeth. These structural changes place the TMJ under strain that can persist into adulthood.
Sleep-disordered breathing Children who snore, breathe noisily during sleep, or stop breathing briefly during the night may have obstructive sleep apnoea — a condition that is significantly underdiagnosed in children. As with adults, disrupted breathing during sleep is associated with jaw muscle activity and grinding, placing ongoing strain on the developing TMJ.
Thumb sucking and oral habits Prolonged thumb sucking, dummy use beyond toddler age, or habits like nail biting and chewing on objects can alter the development of the bite and jaw position. When these habits persist into the years when the permanent teeth are erupting, the effect on jaw alignment can be significant.
Stress and anxiety Children experience stress too — academic pressure, social difficulties, family changes, and anxiety can all manifest physically in the jaw. Childhood bruxism (teeth grinding) is surprisingly common and is often a sign that a child is carrying emotional tension they haven't been able to express.
Jaw injury A knock to the jaw during sport, a fall, or an accident can affect the TMJ — particularly in children, where the joint is still developing. Injuries that seem minor at the time can have longer-term consequences for jaw development and function if not properly assessed.
Early Warning Signs Parents Should Watch For
Because children often can't articulate what they're experiencing — or simply accept discomfort as normal — parents play a crucial role in spotting early signs of jaw problems. Watch for the following:
Sleep and breathing
Snoring regularly, even if mild
Breathing through the mouth during sleep or at rest
Restless sleep — tossing, turning, or waking frequently
Waking unrefreshed despite adequate hours of sleep
Pauses or gasping sounds during sleep
Bedwetting beyond the expected age (a lesser-known sign of disrupted sleep from airway issues)
Jaw and facial signs
Clicking or popping sounds when your child opens or closes their mouth
Complaints of jaw soreness, particularly in the morning
Difficulty opening the mouth fully
The jaw deviating to one side when opening
A noticeably recessed or small lower jaw
Crowded or crooked teeth developing despite no obvious family history
Pain and symptoms
Frequent headaches — particularly upon waking or after school
Ear pain without an ear infection
Neck or shoulder pain or stiffness in a child who isn't particularly active
Facial pain or a sense of tightness around the jaw and cheeks
Behaviour and performance
Daytime sleepiness, difficulty concentrating, or poor school performance — these can all be downstream effects of poor sleep quality caused by airway or jaw problems
Irritability or mood changes that seem out of proportion — again, poor sleep is often the hidden driver
A child who seems to clench their jaw or grind their teeth, or who a partner or sibling has heard grinding at night
Why Early Intervention Matters So Much
The jaw and face continue developing actively throughout childhood and into the mid-teenage years. This means that problems identified during this window can often be addressed while growth is still happening — which produces far better outcomes than waiting until development is complete.
For example, a narrow upper jaw that is causing crowding and bite problems can be gently widened using an orthodontic expander during childhood, when the palate is still relatively flexible. The same intervention in an adult requires surgery. Early identification of mouth breathing can prompt treatment of the underlying cause — enlarged adenoids, allergies, or a narrow airway — before the structural consequences become fixed.
Dr Gray at Dr Gray Dentistry in Durban takes jaw development in children seriously, assessing not just teeth and bite but breathing patterns, jaw position, and facial growth — because these factors are deeply interconnected.
What Happens If It's Left Untreated?
Jaw and airway problems that go unaddressed during childhood don't simply disappear. They tend to follow the child into adulthood in one or more of the following ways:
Established TMJ disorder — joint and muscle problems that become increasingly difficult to treat as structural changes accumulate
Obstructive sleep apnoea in adulthood — the airway anatomy shaped during childhood significantly influences adult airway health
Significant orthodontic problems — crowding, bite issues, and jaw discrepancies that require extensive adult treatment
Chronic headaches and facial pain — often traced back to jaw and posture patterns established in childhood
Learning and behavioural difficulties — in some children, years of disrupted sleep from airway issues have a measurable impact on cognitive development and academic performance
None of these outcomes are inevitable — which is exactly why early assessment matters.
What to Do If You're Concerned
If your child shows several of the signs described in this post, a professional assessment is the right next step. You don't need to wait until symptoms are severe or until your child is old enough to describe the problem clearly. A thorough evaluation can identify what's happening and whether any intervention is appropriate at this stage.
In many cases, early monitoring alone — without active treatment — is the right approach, combined with guidance on habits like mouth breathing or thumb sucking. In others, early treatment produces results that simply aren't possible later.
Bring Your Child to Dr Gray Dentistry, Durban
Dr Gray at Dr Gray Dentistry in Durban, South Africa offers jaw and TMJ assessments for patients of all ages — including children where jaw development, breathing, and bite are all considered together as part of the picture.
If you've noticed any of the signs described above in your child, don't wait and hope they grow out of it. Early eyes on the problem make all the difference.
Book a jaw assessment for your child at Dr Gray Dentistry in Durban today.