Home · Treatment guide · September 10, 2026 · 7 min

Adult palatal expansion, sleep apnea, and why we start with myo

If you've been told you have a narrow upper jaw — or you've seen the term “maxillary constriction” on a sleep study report — you may also have been told that widening the jaw surgically or with a miniscrew-assisted expander can open the airway and improve sleep apnea. That part is real. What's less often explained is the role the muscles play in making the result last. That's where we start.

By Gina Sabbak, RDH — Myofunctional Therapist · Last reviewed: 2026-09-10

The airway starts at the jaw

The roof of your mouth is also the floor of your nose. When the upper jaw (the maxilla) is narrow, the nasal cavity above it is narrow too, and the oral cavity below it has less room for the tongue. The tongue has to sit somewhere — if it can't rest against the palate (the correct posture), it falls back into the airway when you lie down. That's one of the mechanical reasons a narrow palate is associated with snoring and obstructive sleep apnea (OSA).

Widening the maxilla gives the tongue more room and opens the nasal passages. For adults, the expansion itself usually requires more force than a child's — either a surgically assisted rapid palatal expansion (SARPE) or a miniscrew-assisted rapid palatal expansion (MARPE), where temporary anchorage screws help the orthopedic force reach the midpalatal suture even after skeletal maturity.^[1]

What myo does — and why we start there

Myofunctional therapy is targeted exercise for the tongue, lips, and the muscles of the floor of the mouth and soft palate. The muscles are the part of the system that actually holds the result. A wider jaw created by an expander can relapse if the tongue isn't pressing up against the palate afterward — the same low-tongue-rest posture that contributed to the narrow arch in the first place will, given time, start to undo the work.

So before any expander goes in, we want the tongue in the right resting posture (up against the palate, tip behind the front teeth), the lips sealed at rest, and nasal breathing established as the default. That way, when the jaw is widened, the muscles are already trained to maintain the new position. Patients who skip this step often have less stable outcomes, and many of them end up back where they started a few years later.^[2]

There's also a practical reason to start with myo: myofunctional therapy on its own has been shown to reduce the apnea-hypopnea index by roughly 50% in adults and 62% in children.^[3] Some patients who come in thinking they need an expander find that several months of consistent therapy moves the needle enough that they don't need one. Not everyone — but enough that we think it's worth measuring first.

How I quarterback the process

The word “quarterback” gets used a lot in healthcare marketing. Here's what it actually means in our office: I'm the person who looks at the whole picture — your airway, your muscles, your bite, your sleep study, your goals — and decides who needs to be in the room and in what order. You shouldn't have to figure that out on your own, and your orthodontist, ENT, and sleep medicine provider shouldn't have to either.

Step 1 — The 60-minute evaluation

First visit. We look at structure and function: the width and shape of your palate, the posture and mobility of your tongue, how you swallow, how you breathe at rest, whether you have any signs of sleep-disordered breathing. I'll ask about your history — orthodontic work, airway issues as a child, sleep quality, snoring history, allergies, reflux. If you've had a sleep study, I want to see it. If you haven't and the symptom picture suggests OSA, I'll refer you for one before we go further.

Step 2 — The plan, in writing

After the evaluation, you get a written summary: what we found, what I think is going on, what the options are, and who I recommend you see (orthodontist for expansion, ENT for nasal/sinus issues, sleep medicine for CPAP or a mandibular advancement device, allergist, etc.). I send the same summary to the providers we're coordinating with so we're all working from the same page. If you have an existing orthodontist, I'll reach out to them directly.

Step 3 — Myo first, expansion second

If we agree that expansion is the right call, we typically do 8–12 weeks of myofunctional therapy first. The goals during this phase: tongue resting posture up against the palate, lips together at rest, nasal breathing as the default, correct swallow pattern. This is also where we're building the habits that will hold the expansion long-term.

The orthodontist or surgeon I refer you to handles the expansion itself. For most adults, that's either a MARPE (miniscrew-assisted) or a SARPE (surgically assisted) procedure. Both widen the upper jaw; the choice depends on your age, your suture, and what the orthodontist sees on imaging. I don't perform the expansion — that's an orthodontic or surgical procedure, and the right person for it is the right person for it.

Step 4 — Myo during and after expansion

The expander is typically activated for several weeks (you turn a small key once or twice a day to gradually widen it), then held in place as a passive retainer for several months while the bone fills in. During that whole window, we're working together on therapy — tongue posture, lip seal, nasal breathing, swallow. Once the expander comes out, we continue for a few more months to make sure the new patterns are locked in. The total course is usually 9–15 months from start to finish, depending on how much expansion is needed and how the muscles respond.

Step 5 — Long-term check-ins

About six months after the active phase ends, I want to see you again. We're checking that the tongue is still resting where it should, the airway is staying open, and the bite is stable. If anything has drifted, we catch it early. Some patients come back yearly after that; others don't need to. Depends on the case.

Who this is (and isn't) for

Adult palatal expansion is a real, evidence-supported procedure — particularly for adults with a narrow maxilla, sleep-disordered breathing, and a bite that's crowded or crossbite on the sides. The expansion itself is done by an orthodontist or oral surgeon; myo is what makes it stick and what helps the airway side of the picture.

This approach is not a substitute for CPAP if your sleep apnea is moderate to severe — and it's not a substitute for evaluation by a sleep medicine provider. Anyone with witnessed apneas, gasping during sleep, severe daytime sleepiness, or uncontrolled high blood pressure should be in front of a sleep specialist before they start any dental or myofunctional plan. We coordinate with sleep medicine; we don't replace it.

It's also not for every narrow palate. Some adults have a narrow arch but a stable bite, no sleep symptoms, and no airway concerns. If that's you, you don't need this — and we'll be the first to tell you so at the evaluation.

What to bring to the first visit

• Any sleep study report you have (home test or in-lab, either works)
• Recent dental X-rays if you have them (panoramic or cephalometric are most useful)
• A list of current medications — especially anything for reflux, allergies, or sleep
• The names of any other providers you're seeing for this (orthodontist, ENT, sleep medicine, PCP)
• A short note about your goals — “snore less,” “get off CPAP,” “fix my bite,” “breathe through my nose” — whatever brought you in

Starting the conversation

A 60-minute myofunctional evaluation is the right place to begin. We'll look at everything, talk about what we find, and put a written plan together — whether that plan is myo only, myo + expansion, or a referral to someone else who can help. Call (502) 901-8089 or request an evaluation online.

This post is educational and is not medical advice. Adult palatal expansion is a procedure performed by an orthodontist or oral surgeon; myofunctional therapy is adjunctive care. Suspected sleep apnea requires evaluation by a sleep medicine provider before any dental or myofunctional treatment plan. If you think you may have sleep apnea, please talk to your own healthcare provider.