Adult Palatal Expansion
The upper jaw can be widened — structurally, skeletally, permanently — without surgery, and without the wide gap between the front teeth that keeps most patients from ever starting
Your Jaw Can Still Be Widened.
A narrow smile has many origins. Perhaps you sucked your thumb as a child, or breathed through your mouth, or simply inherited a jaw that didn’t develop the width your face needed. Perhaps an orthodontist removed premolars to resolve crowding, straightening your teeth by compressing the arch rather than expanding it to fit them. In each case the result is the same: an upper jaw that was never widened.
Teeth that are straight but a smile that doesn’t fill your face: narrow at the corners, flat in the midface, lacking the width that makes a smile register as bright.
A narrow jaw affects more than the smile. A narrow palate means restricted nasal volume, less room for the tongue, and compromised breathing during sleep. Patients arrive here with decades of mouth breathing they assumed was simply how they were built. With snoring that worsened over time. With a sleep apnea diagnosis that no one connected to the structure of their jaw.
The solution is maxillary skeletal expansion. The procedure is minimally invasive. The results are structural and permanent.
What Expansion Changes
THE SMILE
A wider arch eliminates the dark triangles at the corners of a narrow smile, called buccal corridors. Teeth fill the mouth when you smile. Crowded or rotated teeth that lacked arch space gain room to align.
THE MIDFACE
The upper jaw is the structural foundation of the midface. Widening it expands the bones that form the cheeks and define lateral facial width. The lateral expansion also widens the orbital rim, improving undereye support and the appearance of the infraorbital region. This is a structural change. It cannot be achieved with filler, threads, or any surface treatment.
BREATHING AND THE AIRWAY
The floor of the nasal cavity sits directly above the palate. Expanding the palate increases nasal cavity volume, reduces nasal resistance, and creates space for the tongue to rest in a functional position. For patients with sleep-disordered breathing or a history of airway restriction, expansion treats the structural basis of those conditions, not just the symptoms.
The aesthetic and airway outcomes are products of the same procedure. Patients who come for a wider smile often leave breathing differently.
What Is Adult Palatal Expansion?
Adult palatal expansion widens the upper jaw — the maxilla — at the level of the bone, not just the teeth. A bone-borne maxillary expander, anchored directly to the palate, applies controlled force that stimulates new bone to form and permanently widens the jaw. It is not the same as the tooth-supported expanders used in childhood orthodontics. The maxilla itself is widened.
The treatment has evolved from a single protocol with significant side effects into a family of approaches. The most refined of these eliminates the primary barrier that stopped most patients from proceeding. Each goes by a different name:
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The original bone-borne protocol for adult skeletal expansion. Unlike earlier tooth-supported expanders, MARPE anchors directly to the palate, transferring force to the skeleton rather than the teeth. Expansion is rapid by design: slower activation risks unwanted tooth movement. The speed, however, places significant stress on the facial skeleton and surrounding structures. And as the maxilla widens, a large gap opens between the upper front central incisors and remains open throughout treatment, to be closed with braces afterward.
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A lower-force, longer-duration protocol. Produces equivalent skeletal outcomes with reduced stress on surrounding cranial, facial, and vertebral structures. The preferred approach for patients with jaw tension, TMJ sensitivity, or a history of headaches.
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A protocol combining skeletal expansion with concurrent clear aligner therapy. Expansion and tooth alignment proceed simultaneously. Total treatment time is reduced compared to sequential treatment, and the gap between the front central incisors is managed throughout rather than addressed after expansion is complete.
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An implementation of the DOME protocol using slow expansion concurrent with aligners. Expansion force is lower and applied over a longer duration, reducing stress on surrounding structures. Aligner therapy begins in the early weeks of treatment, managing tooth position in real time as the maxilla widens. The wide gap between the front central incisors that characterises traditional MARPE does not develop.
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A bone-borne expander anchored with longer miniscrews that engage cortical bone bilaterally. Designed for parallel expansion with minimal dental side effects.
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A category of fixed palatal expanders for skeletal expansion. The designs vary. All share one principle: skeletal rather than dental anchorage.
The Gap Between the Front Teeth
This is the reason most patients who have researched palatal expansion have never started.
Traditional MARPE works by separating the two halves of the upper jaw along the midpalatal suture. As the bones move apart, a wide gap opens between the two upper front central incisors, visibly, sometimes dramatically. It remains open throughout the expansion phase.
This is not a small space. At its widest it can measure several millimetres, wide enough that it is the first thing anyone sees. It closes with braces once expansion is complete. Patients are told to expect it, plan around it, and wait.
For most people, that is not a workable arrangement. Months of visible dental disruption, in meetings, in photographs, in daily life, is professionally and socially untenable. Patients research the procedure, understand exactly what it offers, and don’t move forward. That gap between the front teeth is the reason.
It is not a minor inconvenience.
For most patients, it is the reason they never started.
The DOME Zero protocol solves this. Aligner therapy begins concurrently with slow palatal expansion. From the first weeks of treatment, tooth movement works alongside skeletal widening, closing the gap between the central incisors in real time as it forms. That wide separation does not develop. For most patients, the space between the front teeth remains narrow enough throughout treatment that it does not disrupt daily life.
Who Is a Candidate
Adult palatal expansion is indicated for patients with a transverse maxillary deficiency — a jaw that is structurally narrow relative to the lower jaw and face. Common presentations include a narrow smile with visible buccal corridors, a history of premolar extractions, dental crowding that cannot be resolved with alignment alone, a posterior crossbite, and nasal breathing restriction related to palatal anatomy.
Patients of all ages are treated.
The only way to determine candidacy is through a consultation..
The first step is a consultation. Candidacy is assessed. You will understand exactly what expansion would change for your face — and what it would not.
Patients travel from across Rhode Island, Massachusetts, and New England for this procedure.
Frequently Asked Questions
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Yes. For decades it was believed that the midpalatal suture fused in adulthood, making skeletal expansion impossible without surgery. Bone-borne expanders anchored with miniscrews directly to the palate changed this. The miniscrews engage cortical bone and apply force that stimulates the suture to open. The evidence is well established. Adults across a wide age range have been successfully treated.
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Most patients experience pressure during activation rather than pain. The miniscrew placement procedure is performed under local anaesthesia. Some patients experience mild headache or sinus pressure in the early weeks of expansion. The DOME Zero protocol, using slower expansion forces, typically produces fewer and milder symptoms than rapid expansion protocols.
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The expansion phase typically takes three to six months depending on the amount of expansion required and the protocol used. With DOME Zero, aligner therapy proceeds concurrently, so overall treatment time is shorter than sequential expansion followed by orthodontics. Total treatment duration varies by case and is discussed in full at consultation.
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With the DOME Zero protocol, the gap between the front central incisors is managed in real time by aligner therapy as expansion proceeds. For most patients the space remains narrow enough throughout treatment that it does not draw attention. The expander itself sits entirely in the palate and is not visible.
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MARPE uses rapid expansion forces and does not include concurrent aligner therapy. A wide gap opens between the front central incisors during treatment and closes with braces after expansion is complete. DOME Zero uses slow expansion forces concurrent with aligner therapy. Tooth movement manages the central incisor gap in real time. The gap does not develop to the same degree. For most patients considering MARPE, DOME Zero is the more appropriate protocol.
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No. Childhood palatal expansion uses tooth-supported appliances that work while the midpalatal suture is still open and the bones are growing. Adult palatal expansion requires bone-borne anchorage — miniscrews placed directly in the palate — to apply force to the skeleton directly. The mechanism, the appliance, and the clinical outcome are fundamentally different.
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The expander remains in place for a consolidation period after expansion is complete, typically several months, allowing new bone to mature in the widened suture. In the DOME Zero protocol, aligner therapy continues during this period. Once consolidation is confirmed, the expander is removed. Final aligner refinement follows.
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Treatment is priced at consultation based on case complexity, the protocol indicated, and the extent of aligner therapy required. A full fee breakdown is provided at consultation before any commitment is made.
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Yes. A history of premolar extraction is one of the most common presentations in patients seeking adult palatal expansion. Extraction orthodontics narrows the arch rather than expanding it. Skeletal expansion can widen the arch regardless of extraction history. Candidacy is assessed at consultation.
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For patients whose airway restriction is related to a structurally narrow palate, skeletal expansion addresses the structural origin of the problem directly. Expanding the palate increases nasal cavity volume and creates more tongue space. For patients with diagnosed sleep apnea or sleep-disordered breathing, this is discussed as part of the full clinical picture at consultation.
A consultation includes a full assessment of your case, an evaluation of candidacy, and a clear account of what expansion would and would not change for your face. If expansion is not the right treatment for you, you will leave knowing that — and why.