Reviewed by Megan Reznik, DDS, MS
A palate expander widens the upper jaw. In a child whose bones are still growing, the two halves of the upper jaw have not fully fused, so gentle steady pressure can move them apart and create width that was not there before. Once growth finishes, that stops being possible without surgery, which is why timing matters more with this appliance than with almost anything else in orthodontics.
Why an expander gets recommended
Two situations come up most often. A crossbite, where the upper teeth bite inside the lower ones because the upper jaw is too narrow, which left through a growth period can push the jaw to develop off-center. And crowding, where widening the arch creates space and in many cases means teeth do not have to be removed.
Both are on the common orthodontic problems page, and both are what an age-7 check exists to find.
What it feels like
Not painful, but strange for a few days. Children describe pressure rather than pain, felt in more places than parents expect: across the roof of the mouth, in the back teeth, behind the nose, sometimes between the eyes. Speech changes for a few days while the tongue works around the appliance, and saliva production goes up at first. Soft food makes the adjustment much easier.
At some point a space opens between the two upper front teeth. Parents almost always panic about this, and it is the most reassuring thing to know in advance: it is the appliance working. The gap usually closes on its own, and where it does not, closing it is a routine part of the treatment that follows.
Turning it at home
Most expanders are activated with a small key at home, on a schedule your orthodontist sets for your child’s case specifically.
Do the turn at the same time each day, with good light; it takes seconds once you have done it twice. If you miss a turn, do not double up, just carry on and mention it at the next visit. If the key will not go in, or the turn will not complete, stop and call rather than forcing it. Visits fall every 4 to 8 weeks while the appliance is in, and food collects around it, so brush after meals.
Eating and cleaning with an expander
Soft food for the first two or three days makes the whole adjustment easier: yoghurt, pasta, eggs, soup, mashed potato. After that most children eat normally, with the same exclusions that apply to any fixed appliance. Hard and sticky food damages the appliance, and a damaged expander means an unplanned appointment and lost progress.
Food collects around an expander, particularly at the back and in the roof of the mouth. Brush after meals, angling the brush up into the appliance rather than straight at it, and rinse thoroughly afterwards. A water flosser helps and does not replace brushing.
What parents should call about
Most of what happens with an expander is normal and needs no call: pressure after a turn, a lisp for a few days, extra saliva, a gap opening between the front teeth.
Call the office if the key will not go in or the turn will not complete, if the appliance comes loose or an arm of it is digging into the cheek or tongue, or if your child is in genuine pain rather than feeling pressure. None of those is an emergency in the hospital sense, and all of them are worth sorting out before the next scheduled visit rather than after it.
The question parents actually ask
Does an expander change your child’s face? Not in the way the phrase suggests online. It widens the upper jaw, and any external change is subtle. It is not a cosmetic appliance and is not recommended as one. Some children report breathing more easily through the nose afterwards, but that is an observation rather than a promise and not why the appliance is prescribed.
After the expanding stops
The appliance stays in after the widening is finished, which surprises families who assume it comes out the day the turning stops. New bone has to fill the space that was created, and removing the appliance early lets the jaw narrow again. How long that takes depends on the case.
Questions about your child’s expander?
Call the Odessa office at (432) 333-7105 or the Midland office at (432) 682-1222.
Not seen us yet? Dr. Megan Reznik and Dr. Derek Reznik are each a Diplomate of the American Board of Orthodontics, and a child’s first check is free. Request an appointment.