For most children, the first few days with a palate expander are the hardest part. Speech sounds a little different, there is more saliva than usual, and the roof of the mouth feels crowded. Most children then adapt gradually, and the main reminder of the appliance becomes a short spell of pressure after each turn of the key. This guide follows a typical course of treatment from fitting day to removal, so parents know what is normal and when to call.
Fitting day is usually short
Before the appliance is made, the dentist or orthodontist takes a scan or impressions of the upper teeth. Sometimes small elastic separators are placed between the back teeth a few days beforehand to make room for the metal bands, and these can feel tight for a day or two.
On the day itself, the expander is tried in, checked for fit and cemented or bonded to the upper back teeth. Most children do not need an injection for this. Parents are shown how to use the key and given a written turning schedule. It is worth practising the first turn in the chair so the movement feels familiar before you get home.
The first week is mostly about speech, saliva and pressure
The tongue normally rests against the roof of the mouth, so an appliance sitting there takes some getting used to. A mild lisp, extra saliva and a slightly odd feeling when swallowing are all common, and they usually ease gradually as the tongue adapts.
After each turn, children often describe pressure across the palate, behind the nose or under the eyes. It usually fades fairly quickly, and discomfort tends to lessen as treatment goes on. The back teeth holding the bands may also feel tender when chewing for the first few days. If pain is sharp, keeps getting worse, or does not ease after a few days, call the treating dentist rather than waiting.
Turning the key soon becomes routine
The key fits into a small hole in the centre of the screw and is moved in the direction shown on the appliance until the next hole appears. Each turn takes a few seconds. The treating dentist or orthodontist sets how often to turn and for how long, and that schedule varies between children and appliances, so it is best to follow the written instructions rather than a general rule.
A few habits help: turn at the same time each day, with the child lying back and good light; tick off each turn on a calendar; and hold the safety cord if the key has one, so it cannot slip to the back of the mouth. If a turn is missed, do not double up the next day without checking. Call the practice if the appliance feels loose, a band lifts, or the key will not go in.
A gap between the front teeth means it is working
Partway through the turning phase, a space often opens between the two upper front teeth. This is the most common reason parents ring with worries, and it is usually good news. The gap appears because the two halves of the upper jaw are moving apart along the midline of the palate. Once the turning stops, the fibres in the gum gradually draw the front teeth back together over the following weeks to months, and any space that remains can be closed later if braces are part of the plan.
Eating and cleaning around the expander
Soft meals make the first few days easier: pasta, eggs, yoghurt, soups, rice and well-cooked vegetables. After that most children return to a fairly normal diet, cut into smaller pieces. Chewing gum, toffee, caramel and very hard foods such as ice or hard lollies are best avoided for the whole time the appliance is in, because they can bend the expander or loosen a band.
Food lodges easily under the appliance and around the bands. Brushing slowly along the gum line with the bristles angled towards the bands, then rinsing hard with water after meals, removes most of it. A water flosser is useful for flushing out the space between the expander and the palate. Our dentists and oral health therapists can show you and your child a cleaning routine at a review visit, and keep an eye on the gums for signs of inflammation.
The holding months are quiet but they matter
Once the planned width has been reached, the turning stops and the expander stays in place, usually for several months. Nothing much seems to happen during this stage, but it is when new bone forms in the widened area of the palate. Taking the appliance out early makes it more likely that some of the width will be lost, so it is worth keeping going even when the expander has become a minor nuisance.
Review visits continue at intervals set by the treating dentist. When the expander is finally removed, the bands are eased off and the cement polished away, usually without an injection. Some children have a removable retainer afterwards. Many are later reassessed for braces or aligners once more adult teeth have come through, and X-rays may be taken during any later orthodontic treatment where the dentist needs to check the roots, as our article on root resorption after braces explains.
Why some children respond faster than others
The expander works by opening the suture that runs down the middle of the palate. In younger children this seam is flexible, and the bones around the upper jaw offer little resistance. Through the teenage years the edges of the suture interlock more tightly, the bony connections around the upper jaw stiffen, and a conventional expander produces less widening of the bone and more tipping of the teeth. This happens at quite different ages in different children, so the dentist considers stage of growth and tooth development, not just the child's birthday. For older teenagers and adults, other approaches such as bone-anchored expansion may be considered, as described in our article on adult palatal expansion with MARPE.
This variation is one reason a first orthodontic check usually happens earlier than parents expect, often while there is still a mix of baby and adult teeth. Our guide to the first orthodontic check age covers the timing.
Who looks after your child at Lumi Dental
Our general dentists assess children's bites as part of routine examinations and explain whether a narrow upper jaw or crossbite may benefit from expansion. Where the case is more complex, we refer to a registered orthodontist for treatment planning. Our oral health therapists see children and families for check-ups, cleaning and prevention, which is helpful while an appliance is in place. Some parents also ask whether an expander could help with breathing. It is an orthodontic appliance rather than a stand-alone breathing treatment, and our article on mouth breathing in children explains how those concerns are assessed.
Common questions from parents
Can my child play sport or a musical instrument?
Yes, in most cases. A mouthguard is still recommended for contact sport and may need to be remade to fit over the appliance. Wind instruments can feel different for a while as the lips and tongue adjust.
Will the lisp be permanent?
Usually not. In a study of children with rapid expanders, speech was most affected just after fitting, improved gradually while the appliance was in, and returned to its usual level once it was removed (Stevens and colleagues, American Journal of Orthodontics and Dentofacial Orthopedics, 2011).
Is an expander the same as a space maintainer?
No. A space maintainer holds a gap open after a baby tooth is lost early, while an expander actively widens the upper jaw. Our guide to space maintainers for children explains the difference.
If your child has been recommended an expander, or you would like to know whether a narrow jaw or crossbite needs attention, our general dentist team in Melrose Park can assess your child and talk through the next steps. You can also check our current deals before booking.
