Last Updated on June 13, 2026 by Dr. Nader Ehsani
By Dr. Nader Ehsani, board-certified orthodontist (American Board of Orthodontics) · Published June 11, 2026
A palate expander gently widens the upper jaw to make room for teeth, correct a narrow bite, and in many cases support better breathing. The big difference between kids and adults is biology. In a growing child, the two halves of the upper jaw are still joined by an open growth seam, so a traditional expander widens the jaw comfortably. In an adult, that seam has fused, so we use different tools, such as a miniscrew-assisted expander (MARPE) or, in severe cases, a surgically assisted approach. Either way, the goal is the same: a wider, healthier arch and, often, a more open airway.
What a palate expander actually does
The roof of your mouth is also the floor of your nose. A palatal expander applies steady, gentle pressure across the upper jaw to widen it a small, controlled amount. That extra width can:
- Create room for crowded or blocked teeth, sometimes reducing the need for extractions.
- Correct a crossbite, where the upper teeth bite inside the lower teeth.
- Widen a narrow arch that makes the smile look pinched.
- Open the nasal floor, which can make nasal breathing easier for the right patient.
It is one of the most useful tools in orthodontics, and timing decides which version of it we can use.
Why age changes everything: the growth seam
Down the middle of the upper jaw runs a growth seam called the midpalatal suture. In children and younger teens, that seam is still open and responsive, so a traditional expander can separate the two halves of the jaw gently and let new bone fill in. As we move through the late teens and into adulthood, the seam gradually fuses into solid bone. After fusion, pushing on the teeth alone will not widen the jaw, it just tips the teeth. That single fact is why the same problem is treated so differently at age 9 and age 39.
Expansion for kids
For growing children, a palate expander is often the simplest, most effective option, and the ideal window is usually before or during the early teen growth years. This is one of the main reasons orthodontists recommend a first check by about age 7: it lets us catch a narrow jaw, crossbite, or crowding while expansion is still easy and works with the child’s natural growth. Treating early can guide development and sometimes prevent more involved treatment later. You can read more about timing on our early orthodontic treatment page.
Expansion for adults
Adults are not out of options, the approach simply changes. Because the growth seam has fused, we rely on more support to widen the jaw safely:
- MARPE (miniscrew-assisted palatal expansion). Small temporary screws anchor the expander to the bone of the palate rather than only to the teeth, so the force separates the jaw the way it would in a younger patient, without surgery. Learn more on our palatal expansion (MARPE) page.
- Surgically assisted expansion. For severe constriction in adults, a minor surgical step releases the bone so the expander can do its work. We reserve this for cases that genuinely need it.
The result for adults can be just as meaningful: more room, a corrected bite, and frequently better airflow.
The airway connection
Expansion is not only about straight teeth. A narrow upper jaw often goes hand in hand with mouth breathing, restless sleep, and a smaller airway, especially in children. Because the palate forms the floor of the nasal passages, widening it can improve nasal breathing for the right patient. At our practice, we use 3D imaging to evaluate the jaws, bite, and airway together rather than looking at teeth in isolation. If breathing or sleep is part of the picture, see our airway orthodontics and sleep and airway pages.
When to see an orthodontist
If your child snores, breathes through the mouth, or has a crossbite or crowded teeth, an evaluation is worthwhile well before the teen years. For adults wondering whether expansion is still possible, the answer is often yes, with the right technique. The only way to know which path fits is an exam with 3D imaging. Se habla español.
Frequently Asked Questions
Can adults really get a palate expander, or is it only for kids?
Adults can. Because the upper jaw seam has fused, we use a miniscrew-anchored expander (MARPE) or, for severe cases, a surgically assisted approach instead of a traditional child’s expander.
At what age is a palate expander easiest?
Generally before and during the early teen growth years, while the jaw’s growth seam is still open. That is why a first orthodontic check around age 7 is recommended, so we catch a narrow jaw early.
Does a palate expander help with breathing?
It can. Widening the upper jaw also opens the floor of the nasal passages, which may improve nasal breathing for the right patient. We evaluate the airway with 3D imaging before recommending it.
See If Expansion Is Right for You or Your Child
Whether you are a parent or an adult considering treatment, a consultation with 3D imaging gives you a clear answer. Conveniently located in Serra Mesa / Kearny Mesa, serving Mission Valley, La Jolla, Clairemont, and central San Diego.
Schedule your consultation → Request an appointment · (858) 277-8080 · Se habla español.