Reviewed by Dr. Benjamin Wright, board-certified orthodontist
A palatal expander widens a child’s upper jaw so the permanent teeth have room to come in straight and the bite fits together properly. It works because the two halves of the upper jaw have not yet fused in a growing child. Most expanders are turned for about three to four weeks, then stay in place for six months to improve stability.
That timing is the whole reason we like to see children early, because the same correction in a fully grown mouth is a far bigger undertaking.
What an Expander Corrects
A narrow upper jaw creates problems that look unrelated until you understand the cause. Crossbite is the clearest one. When the upper teeth bite inside the lower teeth, the upper arch is usually too narrow, and the jaw learns to shift sideways to find a comfortable position. Crowding is another. Without enough width, permanent teeth erupt overlapped, rotated, or blocked out entirely, and occasionally a tooth cannot come through at all. Correcting the width during growth also makes whatever treatment follows shorter and simpler.
Parents notice some of this at home. A bite that looks off to one side, teeth crossing over each other, difficulty chewing, or a child who habitually breathes through the mouth are all worth an examination. Those are signs to have a specialist look, not diagnoses in themselves. Our page on common orthodontic issues explains each bite pattern, and early orthodontic treatment covers when a first visit makes sense.
How the Expander Works
The appliance is fixed to the upper back teeth and sits against the roof of the mouth. A small screw in the middle expands it. Each turn applies gentle pressure that gradually separates the two halves of the upper jaw, and the body fills that space with new bone.
Once we reach the width the case requires, the turning stops and the expander stays put. That second phase is not optional. Removing an expander before the new bone has matured allows the jaw to drift back toward its original position.
Turning the Expander at Home
We will demonstrate this in person and watch you do it once before you leave.
- In a well-lit room, tip your child’s head back so you can see the screw clearly.
- Place the key in the hole until it is firmly seated.
- Push the key toward the back of the mouth. The screw rotates and the next hole appears. The rotation stops when the key meets the back of the expander.
- Press back and down toward the tongue to remove the key. The next hole should now be visible.
Turn only as often as we have prescribed, usually once a day, and call 410-544-0072 if anything about the appliance looks or feels wrong.
You can also download these instructions in a printable PDF document.
The First Few Days
Expect pressure rather than pain, felt behind the nose for a few minutes after each turn. A gap often opens between the two upper front teeth during the first week. That gap is the expander doing exactly what it should, and it closes on its own as the teeth drift back together.
Speech sounds different at first and eating takes a few days to relearn, though both settle within a week for most children. Keep hard and sticky food away from the appliance so the bands stay cemented, brush around it carefully, and rinse with water after meals.
Frequently Asked Questions About Palatal Expanders
How long does a palatal expander stay in?
Typically seven months in total. The active turning phase is usually three to four weeks, and the rest of the time the expander is simply holding the new width for stability. Complex cases can run longer, and Dr. Wright will give you a case-specific estimate.
Does a palatal expander hurt?
Not usually. Children describe pressure for a few minutes after each turn, plus tenderness in the first day or two. It is milder than most parents expect, and softer food helps.
What happens if we miss a turn?
One missed turn is not a crisis. Turn it as usual at the next scheduled time and carry on, and never double up to catch up. If several turns have been missed, call us before turning again.
Is my child too old for an expander?
It depends on growth, not birthdays. Expansion works best while the upper jaw halves are still separate, which is generally through the later elementary and early middle school years. Once those halves fuse, widening usually requires a surgical approach, which is one reason an early examination is worth having.
Ask Whether Your Child Needs One
Dr. Benjamin Wright, a board-certified orthodontist, will tell you plainly whether expansion is necessary, and whether now is the right moment or a year from now is better. The consultation is complimentary.
Call 410-544-0072 or request an appointment online. Questions about cost and insurance are answered on our cost, insurance, and financing page. Wright Orthodontics is at 479 Jumpers Hole Road, Suite #203, Severna Park, MD 21146.