Narrow Jaw in Children: A Parent's Guide to Palatal Expanders
A narrow upper jaw in children (maxillary transverse deficiency) means the upper jaw has grown narrower than the lower jaw. Palatal expansion started at the right age can usually correct it without surgery.
When you check on your child at night, do you notice that their mouth is open and their breathing sounds uneven? Or when your pediatric dentist told you at the last dental check-up that "your child's teeth are very crowded and the upper jaw is narrow", was your first thought "Will my child need surgery?"
At our KidsDent Istanbul clinic, we often hear the same worry from parents whose child has just been diagnosed with a narrow upper jaw. What we tell them is this: Palatal expansion treatment, started at the right age, can widen a growing child's upper jaw without surgery.
In this guide, we go step by step through how a narrow jaw is diagnosed, how a palatal expander is used, what the treatment involves and what you can do as a parent.
📊 KEY FACTS
AAPD: fixed or removable palatal expanders can be used to widen the upper jaw until the suture in the middle of the palate fuses.*
Results are generally best when treatment starts at around 7–8 years of age (Dr. Esra Yeşilöz Gökçen, Pediatric Dentist).
Average treatment time: 6–9 months (active expansion plus a holding phase).
AAPD: early treatment helps many children, but it isn't needed for every child with a developing bite problem, so a thorough examination comes first.*
What Are the Signs of a Narrow Upper Jaw in Children?
Breathing through the mouth most of the time and snoring at night,
Upper teeth that don't close over the lower teeth like a lid (crossbite),
Overlapping teeth and crowding,
A narrow, high-arched palate,
Speech difficulties (especially with sounds like 's', 'z' and 'sh').
If you have noticed several of these signs, your child may have a narrow upper jaw (maxillary constriction) and may need a palatal expander.
What Can Happen If a Narrow Jaw Isn't Treated?
A narrow upper jaw in children is not only a cosmetic concern. Left untreated, it can affect your child's overall health and facial development. Some of the problems that can develop include:
1. Breathing problems: A narrow upper jaw also means a narrow nasal floor. This can make breathing through the nose harder and disturb sleep. According to the AAPD, obstructive sleep apnea in children has been associated with a narrow upper jaw and crossbite.
2. Facial asymmetry and jaw joint problems: When the upper jaw is narrow, a child may shift the lower jaw to the right or left to find a comfortable bite. Over time this can lead to facial asymmetry and jaw joint (TMJ) problems. The AAPD notes that correcting a crossbite with this kind of jaw shift early can largely eliminate the asymmetry, and recommends doing it as soon as possible.
3. Impacted teeth: If permanent teeth don't have enough room to come in, they can stay trapped in the bone or come in crowded. Children with a narrow jaw are also more likely to lose baby teeth early. In that case a space maintainer may be needed until the permanent teeth come in. Expansion makes room for the existing teeth and can reduce the need for a space maintainer later. Studies cited by the AAPD also show that rapid upper jaw expansion in the early mixed-dentition years can improve the chance of a displaced upper canine erupting.
✅ In growing children, problems like these can often be corrected without surgery by using an upper jaw expander (palatal expander).
What Is a Narrow Upper Jaw?
A narrow upper jaw means the upper jawbone (maxilla) is narrower from side to side than the lower jaw. In an ideal bite, the upper jaw fits over the lower jaw like the lid of a box. Palatal expansion works best in growing children, before the bone has fully hardened.
Causes of a Narrow Jaw
Genetics: Jaw shape runs in families. If a parent has a narrow jaw, the child is more likely to have one too.
Mouth breathing: Breathing through the mouth all the time, for example because of a blocked nose or enlarged adenoids, can let the cheek muscles press the upper jaw inward. According to the AAPD, mouth breathing can contribute to a narrow palate but is not the only or main cause, so your child may also need to be seen by an ear, nose and throat specialist.
Habits: Long-term thumb sucking, prolonged pacifier use and a low tongue position can hold back the growth of the upper jaw and lead to narrowing. The AAPD recommends helping children stop pacifier and thumb-sucking habits by about 36 months of age.
Signs of a Narrow Jaw
As a parent, watch for these signs:
Crossbite: the back teeth bite the wrong way round
Crowded teeth: not enough room for the permanent teeth to come in
Narrow, V-shaped palate: the roof of the mouth, normally U-shaped, is narrow and deep
Constant mouth breathing: breathing through the mouth during the day and at night
Speech problems: difficulties caused by the tongue not having enough room to move
When Should Palatal Expansion Be Done in Children?
The best time for palatal expansion is between 7 and 8 years of age. At this age, the seam of cartilage in the middle of the upper jaw has not yet turned to bone. The AAPD likewise notes that skeletal expansion with fixed or removable expanders can be used until this suture fuses. The palatal expander, often just called an "expander", gently pushes the left and right halves of the upper jaw apart so that new bone can form. It has a screw in the middle, and each turn widens the jaw by about 0.25 mm.
Benefits of starting early:
Changes are usually visible within 3–6 months
Usually more comfortable than treatment at an older age
Can reduce the likelihood of jaw surgery later on
Can shorten overall orthodontic treatment
💡 Advice from Dr. Esra Yeşilöz Gökçen, Pediatric Dentist (Pedodontist) and founder of KidsDent Istanbul:
The ideal age for upper jaw expansion is 7–8 years.
After age 12–14 the bone starts to harden, but expansion without surgery is still possible during adolescence.
After age 16–18, MARPE (mini-implant-assisted expansion) or surgical options may be considered.
Types of Palatal Expanders: Removable and Fixed
1. Removable expanders
Usually used for children aged 7–9 or for mild narrowing
Your child can put the expander in and take it out
Needs to be worn 20–22 hours a day to work
Easy to clean
Success depends mostly on your child's cooperation
2. Fixed expanders (Hyrax)
Bonded to the teeth and can't be taken out
Works faster and more predictably
Doesn't depend on your child's cooperation
In some cases, especially for children aged 13 and over who are concerned about appearance, clear aligners can correct mild to moderate narrowing. Because aligners are nearly invisible, they don't get in the way of social life, and they can be taken out for special occasions. They aren't suitable for every case, so your pediatric dentist needs to assess your child first.
Is Upper Jaw Expansion Possible Without Surgery?
Yes. Treatment up to around age 16–18 is usually done without surgery. With MARPE, expansion without surgery is sometimes possible even in young adults.
Expansion is often the first stage of orthodontic treatment in children. The jaw is corrected first, and other orthodontic treatment is planned afterwards if needed. This can shorten any later treatment with braces.
Advantages of treatment without surgery:
No general anesthesia, so no hospital stay
Quick recovery
Low risk of complications
How Is a Palatal Expander Put In and Taken Out?
Fixed expanders: Your pediatric dentist bonds them to the teeth. Parents and children should never try to remove a fixed expander. Only the dentist removes it.
Removable expanders:
Putting it in:
Place the expander against the roof of the mouth
Push it up until you hear a "click"
Check that it is fully seated
Taking it out:
Hold it by the back clasps
Pull it gently downward
Don't force it
⚠️ IMPORTANT
Removable expanders should only be taken out for eating and brushing.
They need to be worn 20–22 hours a day.
The Treatment Process: What to Expect From Start to Finish
Palatal expansion follows a planned sequence:
1️⃣ First visit
A detailed examination of the mouth, with photos and X-rays (the AAPD recommends a full examination with records such as X-rays and dental models before any treatment plan)
A treatment plan is prepared
2️⃣ Making the expander (1–2 weeks)
Impressions of the teeth are taken and the expander is made in a laboratory
3️⃣ Active expansion (1–3 months)
Once your child starts wearing it, the screw is turned at set intervals
Regular check-ups with the dentist
A gap opens between the front teeth (a sign that the expansion is working)
4️⃣ Holding phase (3–6 months)
The screw is locked and the expander stays in place
New bone forms in the widened area
How Long Does Palatal Expansion Take? A Stage-by-Stage Guide
Stage | Duration | What happens |
First assessment | 1 day | Examination, X-rays, treatment plan |
Making the expander | 1–2 weeks | Impressions taken, expander made in a lab |
Fitting | 1 day | Expander fitted, parents shown how to use it |
Active expansion | 1–3 months | Screw turned daily as instructed, check-ups every 2–4 weeks |
Holding phase | 3–6 months | Expander stays in place while new bone forms |
Removal | 1 day | Expander removed, need for a retainer assessed |
Total | 6–9 months | Bone fully healed and stable |
Although treatment takes 6–9 months on average, each stage can vary with your child's growth and cooperation.
Does Palatal Expansion Hurt?
Most children feel pressure rather than pain. A feeling of mild pressure after the screw is turned is normal.
In the first few days:
Simple pain relief can help if needed.
We recommend soft foods for the first few days of treatment.
Most children adjust within 3–5 days.
During treatment, a gap will open between the two front teeth. This is the clearest sign that the treatment is working.
The gap usually closes on its own over time.
Home Care Guide for Children Wearing a Palatal Expander
Daily hygiene is very important. Make sure your child brushes after every meal, and don't skip the interdental brush.
Use expander cleaning tablets 2–3 times a week.
Food tips: foods to avoid
Sticky foods (chewing gum, caramel, Turkish delight)
Very hard foods (nuts, hard sweets, ice)
When should you call your dentist?
Contact your pediatric dentist if:
The expander breaks
The screw won't turn
There is severe pain or swelling
The expander becomes loose
Do's and Don'ts With a Palatal Expander
✅ DO | ❌ DON'T |
Brush after every meal | Chew gum while wearing the expander |
Wear the expander 20–22 hours a day | Turn the screw backwards |
Follow your dentist's schedule | Wait if the expander breaks |
Choose soft foods | Eat hard foods (nuts, ice) |
Go to regular check-ups | Change how often you turn the screw on your own |
Use an interdental brush | Neglect cleaning the expander |
Following these rules directly affects how well the treatment works and lowers the risk of complications.
Pediatric Dental Care in Ataşehir and Ümraniye
Your child's teeth and jaw development deserve early attention. If you notice mouth breathing, crowded teeth or signs of a narrow jaw, an early assessment often means treatment can be done without surgery.
Ataşehir and Ümraniye families can easily reach our clinic near the Istanbul Finance Center, where we provide palatal expansion treatment with an approach designed for children.
Contact us to have your child's jaw development assessed or to ask any questions.
Frequently Asked Questions
How long is a palatal expander worn?
The whole process takes 6–9 months on average. The holding phase is essential for new bone to form.
Does a palatal expander hurt?
Most children feel pressure rather than pain. The mild pressure after a turn usually fades within minutes, and any tenderness in the first days can be eased with simple pain relief.
Is the expander taken out for meals?
Removable expanders: yes, they come out only for eating and brushing. Fixed expanders: no, they can't be taken out, so avoid sticky and hard foods.
At what age is a palatal expander used?
The ideal age is 7–8. Removable expanders are typically used at 7–9. From 18, MARPE or surgical options may be considered.
Does a narrow upper jaw affect speech?
It can. A narrow palate limits how the tongue moves, and expansion can help with speech.
How can I tell if my child has a narrow upper jaw?
Signs include:
Crossbite,
Crowded teeth,
Mouth breathing,
A narrow, V-shaped palate,
Speech problems.
What causes a narrow jaw?
Genetics (jaw shape that runs in families) and environmental factors (mouth breathing, enlarged adenoids, thumb sucking, pacifier use).
Up to what age can a narrow jaw be expanded?
Treatment is easier at a younger age (7–8 is ideal). After 18, MARPE or surgical options may be considered.
What if my child refuses to wear the expander?
This is common. A reward chart, positive framing ('superhero teeth') and stories of other children who have worn one can help. The first 3 days are usually the hardest.
Can my child go to school with an expander?
Yes. Fixed expanders stay in all the time. Removable expanders should also be worn during school hours and only taken out at lunch to be cleaned.
Should braces come first?
No. Expansion comes before braces: first the 'house' is widened, then the 'furniture' (the teeth) is arranged. This can shorten treatment.
Can the jaw narrow again after expansion?
The risk is low when treatment is done correctly. Completing the holding phase, treating mouth breathing and wearing a retainer help keep the result.
Does a palatal expander change the shape of the face?
Expansion can make the smile look wider and more balanced, and once nasal breathing improves, many children look more rested. How much changes varies from child to child.
Still have questions?
Our pediatric dentist is happy to help with your child's teeth and jaw development.
