You left the orthodontist's office with a plan: a palatal expander, starting next month. Then someone — a dentist, a friend, a video — told you that myofunctional therapy can do the same thing without the appliance, or that the expander is pointless without the therapy.
Both of those claims misunderstand what each one does. An expander and myofunctional therapy are not competing treatments. They act on two different tissues, on two different timescales, and the research that exists on each points toward using them together rather than choosing.
One Moves Bone. The Other Changes Habit.
A palatal expander is a structural intervention. The American Association of Orthodontists describes the device as sitting "across the roof of the mouth, also known as the palate" and attaching "to the upper back teeth," with some versions "adjusted by turning a small screw to gradually widen the upper jaw" and others using "built-in springs or wires." It works on the midpalatal suture — the seam where the two halves of the palate meet — and the AAO is direct about the mechanism: an expander "can correct a crossbite by widening the underlying bone."
Myofunctional therapy does not touch bone. It changes function: where the tongue rests when nobody is thinking about it, whether the lips seal, whether air moves through the nose or the mouth, and how the swallow is organized. It is exercise and habit work, delivered over months.
So the division is clean. The expander is the only one of the two that can make a narrow jaw wider. Therapy is the only one of the two that can change what the tongue does with the space. Neither substitutes for the other, and a plan that includes only one of them is leaving something on the table.
What an Expander Is Actually Prescribed For
It helps to know the real indication list rather than the one circulating online. The AAO names four: crossbite ("a palatal expander can correct a crossbite by widening the underlying bone"), severe crowding ("a narrow jaw can lead to inadequate space for ideal teeth alignment"), impacted teeth ("palatal expanders increase the width of the jaw to improve the space available for erupting permanent teeth"), and breathing issues ("sometimes, palatal expanders are prescribed when a child has trouble breathing"), where "the expander widens the nasal floor and the jaw, which can improve nasal airflow."
The AAO is also clear that this is not a universal recommendation: "not every patient will need a palatal expander," and they are "typically reserved for treating severe malocclusions."
If your child's expander was prescribed for a crossbite or for crowding, that is the mainstream, well-established use of the appliance, and nothing below should be read as a reason to question it.
The Age Window Is Real, and It Is Not About Birthdays
This is the part that makes the sequencing question urgent rather than leisurely. Conventional expansion depends on the midpalatal suture still being open enough to separate. Once it has matured, the same appliance produces more tooth movement and less actual skeletal widening.
Chronological age predicts suture maturation only roughly. A 2026 study in Clinical Oral Investigations (Gu et al.) staged 3,162 CBCT scans from people aged 3 to 90 and found the optimal age threshold for distinguishing the earlier maturation stages sat at 11.2 years — 11.2 in males, 10.75 in females, with girls maturing earlier. That is a population threshold for deciding when imaging is informative, not a deadline for an individual child. The AAO frames the same point clinically: expanders are "most commonly used to treat growing children and young teenagers," and the orthodontist weighs "age, skeletal maturity, and gender (girls finish growing sooner than boys)."
After fusion, the options change rather than disappear: orthodontists move to bone-anchored expansion or a surgical approach, a decision a 2026 dataset study describes as "favoring traditional rapid palatal expansion (RME) for unclosed MPS and bone-anchored RME or surgery for fused cases."
The practical consequence: "let's try therapy first and see" is a reasonable thing to say about a habit. It is a much more expensive thing to say about a suture that is closing.
Where the Expander's Evidence Is Strong, and Where It Is Contested
Here the honest answer splits in two, and conflating the halves is how both the pro-expander and anti-expander arguments online go wrong.
For the bite indications — crossbite, crowding, making room for teeth that cannot erupt — expansion is standard orthodontic care and is not what the research below questions.
For the airway claim, the evidence is genuinely unsettled. A 2017 systematic review and meta-analysis in The Laryngoscope (Camacho et al.) pooled 17 studies covering 314 children, mean age 7.6, who had both transverse maxillary deficiency and obstructive sleep apnea. The apnea-hypopnea index fell from 8.9 to 2.7 events per hour — a 70% reduction — and lowest oxygen saturation improved from 87.0% to 96.0%. But the number that rarely gets quoted alongside it is the cure rate: among the 90 patients for whom it could be calculated, only 25.6% reached an AHI under 1. The authors' own closing note asks for "randomized trials and more studies reporting long-term data" precisely to "determine the effect of growth and spontaneous resolution of OSA."
A 2022 systematic review in Sleep Medicine Reviews (Fernández-Barriales et al.) went looking for exactly that controlled evidence and found almost none: one randomized trial comparing expansion against watchful waiting, which "showed no statistically significant differences" in AHI. Their conclusion was blunt — in the absence of such evidence, expansion "should not be recommended for the treatment of pediatric OSA." The same team published an update in 2026 after three new randomized trials appeared; none of the three included a watchful-waiting arm, two found marginal AHI improvement and one found none, and the authors held their position: "extreme caution is warranted before recommending RME as a treatment for pediatric OSA."
It is worth noticing that the AAO's own page stops exactly where the evidence does. It claims improved nasal airflow. It does not mention sleep apnea.
The Tongue Is What Lives in the New Space
Now the other direction — the case that the expander needs the therapy.
The first clue is inside the Camacho meta-analysis itself. Expansion worked considerably better in children who had already had an adenotonsillectomy or who had small tonsils (a 73–95% AHI reduction) than in children with large tonsils (61%). Order of operations matters: the appliance delivers more when the rest of the airway has already been addressed.
The second is more direct, and it is specifically about expansion. A 2015 systematic review and meta-analysis in Sleep (Camacho et al.) — the same review that produced the widely cited finding that myofunctional therapy "decreases apnea-hypopnea index by approximately 50% in adults and 62% in children" — includes a pediatric study of children who had been cured of obstructive sleep apnea after adenotonsillectomy and palatal expansion. Four years later, the 11 who continued myofunctional therapy were still cured, with an AHI of 0.5. The 13 who did not had recurrent sleep apnea, with an AHI of 5.3. Our guide to myofunctional therapy vs. tonsillectomy covers that study in full, including the honest asterisk it deserves: it is small, it was not randomized, and the children chose whether to do the therapy rather than being assigned.
The third is a randomized trial, which is rarer in this literature than it should be. Villa et al., in Sleep and Breathing, took children who still had residual obstructive sleep apnea six months after adenotonsillectomy and randomized them to oropharyngeal exercises or to a control group. After two months, the exercise group's AHI had improved by 58.0% against 7.0% in the controls, alongside measured reductions in oral breathing and increases in lip seal and lip tone.
None of this makes therapy a cure either. The Camacho review's own conclusion is that myofunctional therapy "could serve as an adjunct to other obstructive sleep apnea treatments" — adjunct being the operative word — and ASHA adds that more study is needed on compliance and long-term effects. But the pattern across all three findings is consistent: the structural work opens the space, and the muscle work is what keeps it.
How the Two Actually Sequence
- The expander decision belongs to the orthodontist. Whether your child needs one, which type, and when are skeletal questions answered with an examination and imaging. Therapy does not widen a jaw and should never be used to postpone a decision with a closing window attached to it.
- During active expansion, the targets change. The appliance physically occupies the palate — which is exactly where a resting tongue is supposed to sit. Anything built around palatal tongue placement usually looks different while the appliance is in than it does afterward, so this is worth asking both providers about rather than assuming.
- After removal is when retraining earns its place. That is the point at which the question stops being "can we make this wider" and becomes "will this hold." A tongue that still rests low, with the lips apart and the breathing going through the mouth, is working against the result.
- If the referral came from the orthodontist, the habit is usually why. Orthodontists refer for myofunctional therapy when something muscular looks likely to undo their work — commonly a tongue thrust or chronic mouth breathing. Our guide to whether myofunctional therapy can fix an overbite covers what muscle work can and cannot change about a bite, and what the research shows about relapse after orthodontic treatment.
When It Really Is One and Not the Other
Sometimes the answer genuinely is a single treatment.
Expander only, or expander first. A clear transverse deficiency with a closing suture, and no habit findings on examination — no tongue thrust, lips sealing normally, nasal breathing intact. There is nothing for therapy to retrain.
Therapy only. No skeletal problem the orthodontist wants to correct, but a tongue that rests low, open-mouth posture, or a swallowing pattern pushing against the teeth. Not every narrow-looking palate is a transverse deficiency, and not every mouth-breathing child needs an appliance. Our page on myofunctional therapy for kids covers how readiness and home practice shape that plan.
Neither, yet. Snoring and restless sleep in a child who has not been evaluated is a reason to see a physician, not to buy a treatment. If sleep-disordered breathing is the real concern, that assessment comes first — see myofunctional therapy and sleep apnea for where therapy fits and where it does not, and mouth breathing in children for the full list of causes worth ruling out.
What Bloom Does and Does Not Do
Bloom does not place appliances, does not decide whether your child needs an expander, and does not provide orthodontic treatment. Those are the orthodontist's calls, made with an examination and imaging we do not perform.
What Laura Friedman, MS, CCC-SLP, QOM provides is the other half: evaluating tongue resting posture, lip seal, nasal breathing and the swallow, building the retraining program, and coordinating it with the orthodontist's plan and timeline. Sessions run in person at our Dallas office or through online myofunctional therapy nationwide.
Frequently Asked Questions
Can myofunctional therapy replace a palate expander?
No. A palatal expander widens the upper jaw by applying pressure across the midpalatal suture — the AAO describes it as correcting a crossbite "by widening the underlying bone." Myofunctional therapy changes muscle function and habit: tongue resting posture, lip seal, nasal breathing, and the swallow. No amount of exercise widens bone. If an orthodontist has identified a transverse problem with the jaw, therapy is not an alternative to correcting it.
Can a palate expander replace myofunctional therapy?
Also no, and this is the half most families are not told about. An expander creates space; it does not teach the tongue to live in it. Among children in one pediatric study who had been cured of sleep apnea after adenotonsillectomy and palatal expansion, the 11 who continued myofunctional therapy were still cured four years later (AHI 0.5), while the 13 who did not had it come back (AHI 5.3).
Is my child too old for a palate expander?
That is a question for an orthodontist with an image, not a birthday. A 2026 study of 3,162 CBCT scans put the useful age threshold for suture maturation at about 11.2 years, slightly earlier in girls — but that is a population average, not a rule about your child. Once the suture fuses, orthodontists turn to bone-anchored appliances or a surgical approach.
Does a palate expander cure sleep apnea?
It often helps and rarely cures. A 2017 meta-analysis of 17 studies and 314 children found AHI dropped about 70% after expansion, but the cure rate where calculable was only 25.6%. A 2022 systematic review found just one randomized trial against watchful waiting, showing no significant difference, and its 2026 update concluded that "extreme caution is warranted before recommending RME as a treatment for pediatric OSA." The AAO's own expander page mentions nasal airflow and never mentions sleep apnea.
Should therapy happen before, during, or after the expander?
Ask the orthodontist placing the appliance. What is worth knowing is that the appliance occupies the palate while it is in — where the resting tongue is supposed to sit — so palatal placement targets look different during active expansion than after removal. The period after the appliance comes out is when retraining matters most, because that is when the question becomes whether the new width holds.
Does Bloom place expanders or do orthodontics?
No. Laura Friedman is a speech-language pathologist and Qualified Orofacial Myologist, not an orthodontist or dentist. Bloom does not place appliances, decide whether an expander is needed, or provide orthodontic treatment. What Bloom provides is the muscle-and-habit side, coordinated with the orthodontist's plan.
Got a Plan for the Appliance but Not for the Muscles?
If an orthodontist has recommended an expander — or already finished one — the useful next question is whether anything about the tongue, lips, or breathing is working against the result. Schedule a free consultation with Laura Friedman, MS, CCC-SLP, QOM — in person in Dallas or online nationwide — for an evaluation of what the muscles are actually doing, and a straight answer about whether therapy belongs in the plan.