Why You (or Your Child) Grind Your Teeth at Night, and the Airway Link
“It’s just stress.” That’s the explanation most people get for nighttime teeth
grinding, for kids and adults alike. It’s not wrong, exactly. Stress is a real
factor. But it’s incomplete, and for a lot of patients it’s not even the main
driver.
A newer, better-supported way to think about grinding: it’s often about room, not
just stress. Specifically, whether the tongue has enough space to sit where it’s
supposed to.
The room-for-the-tongue hypothesis
Here’s the mechanism. When the jaw is narrower than it should be, the tongue
doesn’t have a stable resting spot against the roof of the mouth. At night, when
muscle tone drops and everything relaxes, the tongue moves around trying to find
somewhere to settle. That movement can bounce the jaw back and forth, which shows
up as grinding.
This doesn’t mean stress plays no role. It means that in a lot of cases, the grinding
is the symptom of a structural problem (not enough tongue space), not a
standalone habit that needs to be managed on its own.
The practical test of this idea is what happens when you actually create more room.
When we expand the jaw using our BioX™ Protocol (Bio Expansion), giving the tongue a wider space to
rest in, most kids see a significant drop in grinding after just one round of
expansion. Some children with very narrow jaws need a second round to get the same
result, but the pattern holds consistently enough that we treat tongue space as a
real, addressable factor, not just a theory.
Kids, adults, or both?
Both. We see this pattern across ages, with one important difference:
- In children, expansion alone often produces a dramatic, fairly clean
improvement, because the jaw is still responsive to growth-guided treatment. - In adults, expansion still shows good improvement, but adult cases tend to be
more multifactorial. Years of compensations, joint changes, and other habits layer
on top of the airway piece, so it’s rarely the single whole answer the way it can
be in a growing child. It’s still worth addressing.
What we do about grinding directly
For straightforward grinding, we fit night guards in-house, a reasonable,
immediate way to protect the teeth while any underlying cause gets addressed. When
grinding comes with significant TMJ symptoms (real joint pain, clicking, limited
opening), we refer out to a TMJ specialist we trust, because that level of joint
involvement needs dedicated evaluation beyond what a night guard or expansion alone
can fix.
The order of operations that makes sense to us: protect the teeth now with a guard
if needed, and investigate whether a narrow jaw is the underlying driver worth
correcting.
When to take grinding seriously
Occasional grinding during a stressful week isn’t automatically a red flag. It’s
worth a closer look when it’s:
- Frequent or nightly
- Loud enough that a partner or parent hears it from another room
- Paired with jaw soreness or headaches in the morning
- Showing up alongside snoring, mouth breathing, or restless sleep: the same
symptom cluster that points to a narrow airway more broadly
Take the first step
👉 Take the 60-second airway screening →
Or call to schedule an evaluation:
Northridge: (818) 341-5150 · Newbury Park: (805) 498-7785
Medical disclaimer: This article is educational and is not medical or dental advice,
diagnosis, or treatment. Teeth grinding (bruxism) has multiple possible causes,
including stress, bite alignment, and TMJ disorders; significant jaw pain or joint
symptoms should be evaluated directly. Individual results vary. Medically reviewed by
Dr. Yoram Kohanzadeh, DDS, orthodontist, Smile By Dr. K, Northridge & Newbury Park,
CA.