Tongue thrust is a swallowing pattern where the tongue pushes forward against or between the front teeth, instead of up against the roof of the mouth, every time a person swallows. Because swallowing happens hundreds of times a day, that repeated forward pressure can gradually push the front teeth out of alignment — often contributing to an open bite or a noticeable gap between the upper front teeth.
Why Tongue Position Matters So Much
A typical, mature swallowing pattern rests the tongue tip against the roof of the mouth, just behind the front teeth, while the back teeth do the work of holding the bite together during the swallow. In a tongue thrust pattern, the tongue instead pushes forward, sometimes visibly appearing between or against the front teeth. It’s a normal swallowing pattern for infants, and most children naturally transition to the mature pattern as they grow — but for some kids, the forward-thrusting pattern persists well past the age it should have resolved.
Because this happens with every single swallow, day after day and year after year, even a small amount of forward pressure adds up to real, measurable tooth movement over time.
What Causes Tongue Thrust to Persist?
- Extended thumb sucking, pacifier use, or bottle use past the age when they’re typically outgrown
- Chronic mouth breathing or nasal obstruction, which changes resting tongue position
- Enlarged tonsils or adenoids that push the tongue forward
- A tongue-tie that restricts the tongue’s ability to reach the roof of the mouth
- Simply an established habit that never transitioned to the mature swallow pattern
How Tongue Thrust Affects Alignment
The most common result is an open bite, where the front teeth don’t meet because the tongue has been pushing between them during every swallow. It can also contribute to flared or protruding upper front teeth, a narrow upper arch, and in some cases a lisp or other speech difficulty, since tongue position during speech and during swallowing are closely related.
How Is Tongue Thrust Treated?
Treatment usually has two parts, and both matter: correcting the habit itself, and correcting whatever tooth movement it has already caused.
Addressing the Habit
Myofunctional therapy — a series of targeted exercises that retrain tongue posture and swallowing pattern — is the most common approach, often guided by a speech therapist or myofunctional therapist working alongside your orthodontist. In some cases, a small orthodontic appliance called a tongue crib is used as a physical reminder that discourages the forward-thrusting motion while the new pattern becomes habit.
Addressing the Bite
Once the habit is under control, braces, clear aligners, or in select cases temporary anchorage devices (TADs) can close the resulting open bite or realign teeth that shifted from years of forward pressure.
Our team at Davis & Goldberg Orthodontics looks for tongue thrust patterns during early evaluations specifically because treating the tooth movement without addressing the habit behind it tends not to hold — the teeth just drift back toward where the tongue keeps pushing them.
Tongue Thrust vs. Normal Infant Swallowing
It’s worth emphasizing that a forward tongue-thrust swallow is completely normal in infancy — it’s actually the pattern babies use instinctively while nursing or bottle-feeding. Most children naturally transition to the mature, tongue-up swallowing pattern somewhere between ages 2 and 6 as their oral muscles and coordination develop. The concern isn’t the pattern itself in a toddler; it’s a thrust pattern that persists well past that typical transition window, continuing to exert forward pressure on the teeth long after it should have resolved on its own.
What a Tongue Crib Feels Like
A tongue crib is a small fixed or removable appliance with a wire loop or cage positioned just behind the upper front teeth, placed specifically to block the tongue from pushing forward during swallowing. Most children notice it for the first few days, particularly while eating and speaking, but adjust within one to two weeks as swallowing naturally routes around the appliance. It’s not painful, though there’s a genuine adjustment period, and our team checks in during that window to make sure a child is adapting comfortably.
How Tongue Thrust Gets Diagnosed
Spotting a persistent tongue thrust pattern usually happens during a routine exam, when our orthodontists watch how a child swallows and check the position of the front teeth for signs of forward pressure — a gap that keeps recurring, front teeth that look progressively more flared, or a visibly low resting tongue posture are all clues. At Davis & Goldberg Orthodontics, we often combine this observation with digital scans to track whether a gap or open bite is stable, closing, or continuing to widen over successive visits, which helps confirm whether an active thrust pattern is still at work.
Involving a Myofunctional Therapist
For persistent cases, we frequently recommend working with a myofunctional therapist alongside orthodontic treatment. These specialists focus specifically on retraining oral muscle patterns — tongue posture, swallowing, and sometimes breathing — through structured exercises done at home and reviewed periodically. We coordinate directly with these providers when a child is a patient of ours, sharing what we’re seeing dentally so the therapy and the orthodontic plan reinforce each other rather than working in isolation.
Frequently Asked Questions
At what age is tongue thrust considered a problem rather than normal?
Some forward tongue movement during swallowing is normal in infants and toddlers. If the pattern hasn’t transitioned to a mature swallow by around age 6 to 8, it’s worth having an orthodontist or speech therapist take a look.
Can tongue thrust come back after treatment?
If the underlying habit isn’t fully retrained, yes — which is why myofunctional therapy or a tongue crib is typically paired with, rather than skipped in favor of, straightening the teeth themselves.
Does tongue thrust always cause an open bite?
Not always, but it’s one of the most common causes. The exact effect depends on the strength and frequency of the thrust and how a child’s teeth and jaw are otherwise developing.
Is tongue thrust related to a tongue-tie?
Sometimes. A tongue-tie can restrict the tongue’s ability to reach the roof of the mouth, which can contribute to or worsen a tongue thrust pattern, so the two are sometimes evaluated together.
Is a tongue crib the only appliance used for tongue thrust?
It’s a common option, but myofunctional therapy exercises are sometimes used alone or alongside a crib, depending on the child’s age, cooperation, and how established the pattern is.
Can adults have a tongue thrust pattern too?
Yes — while it’s most often identified and treated in childhood, an adult can still have a persistent thrust pattern, and myofunctional therapy alongside orthodontic treatment can help address it at any age.
Does thumb sucking always lead to tongue thrust?
Not always, but prolonged thumb sucking is one of the more common contributing habits, since it can affect resting tongue posture and delay the natural transition to a mature swallowing pattern.
How is tongue thrust actually diagnosed?
An orthodontist typically observes the swallowing pattern directly, checks resting tongue posture, and looks for the physical signs it can leave behind, like an open bite or flared front teeth, during a routine exam.
Disclaimer: The content on this blog is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of qualified health providers with questions you may have regarding medical conditions.