Teeth Grinding in Kids: Understanding Bruxism

A grinding sound from your child's room at night is common enough that most parents hear it at some point. Teeth grinding, known as bruxism, usually passes on its own. But it is worth understanding what drives it, because sometimes grinding has less to do with the teeth and more to do with how a child is breathing while asleep.

What Bruxism Looks Like

Bruxism is the clenching or grinding of teeth, most often during sleep. Parents usually notice it as a nighttime sound, though sometimes the first clue is a complaint of jaw soreness, a morning headache, or a dentist pointing out worn tooth surfaces.

A few patterns are worth telling apart:

• Occasional grinding during a growth spurt or a stressful stretch, which is usually nothing to worry about

• Frequent or loud grinding on its own, which is more of a dental-wear question

• Grinding paired with snoring, restless sleep, or daytime tiredness, which points toward the airway rather than just the teeth

That last combination is the one worth a closer look.

The Airway Connection

Research in the Journal of Clinical Sleep Medicine, published by the American Academy of Sleep Medicine, has documented sleep bruxism occurring alongside obstructive sleep apnea in children. The theory: when a child's breathing is partly obstructed during sleep, the body sometimes responds by shifting the jaw and grinding, an unconscious effort to open the airway and keep air moving. The grinding, in other words, can be a symptom rather than the issue itself.

This is why mouth breathing, snoring, and grinding so often show up together. A child who breathes through the mouth at night tends to hold the jaw and tongue in a position that narrows the airway, which can trigger the same protective response. Mouth Breathing, Snoring, and Other Red Flags to Watch covers the fuller cluster of signs, since they rarely travel alone.

Where the Tongue Fits In

Where the tongue rests has a lot to do with how open the airway stays during sleep. A tongue that rests low and forward instead of up against the palate can crowd the airway and encourage mouth breathing, both of which are linked to grinding. Improving daytime oral posture, lips together, tongue resting up, can support better nighttime breathing over time. Proper Tongue Posture: What It Is and Why It Matters explains why that resting position is so central, not just to breathing but to how the jaw and teeth develop.

A night guard from the dentist protects the teeth from wear, and it is worth using if grinding is heavy. But a guard treats the damage, not the cause. That's where an evaluation is useful: it can tell you whether oral posture is part of what's feeding the grinding, not just the tooth wear it leaves behind, and Myofunctional Therapy: What It Is and How It Works describes how a structured program builds healthier resting posture and breathing habits from there. If your child grinds regularly alongside any of the signs above, start a conversation about whether a closer look makes sense.

This is general information, not medical advice. Persistent grinding or signs of disrupted breathing during sleep should be evaluated by your child's pediatrician or dentist.