What Are Palatal Expanders and Does My Child Need One?

What is a Palatal Expander?

The palate is the roof of your child’s mouth. In growing children and teens, the upper jaw is actually made up of two separate bones that are joined in the middle by a growth plate called a suture. This suture does not fully fuse until the late teenage years, which means that during childhood and early adolescence, we have a window of opportunity to gently guide the width of the upper jaw.

A palatal expander is an orthodontic appliance that takes advantage of this window. It applies gentle, steady pressure to gradually widen the upper jaw over a period of several months. Once the desired width is achieved, the expander stays in place for a little longer to allow new bone to form and stabilize the result.

Why Would My Child Need One?

The most common reasons we recommend a palatal expander include:

• A narrow upper jaw. When the upper jaw is too narrow, the upper and lower teeth do not fit together properly. This can cause a crossbite, where some of the lower teeth sit outside the upper teeth when your child bites down.
• A narrow palate means there simply is not enough room for all the permanent teeth to come in straight. Expanding the jaw creates space, which can reduce or sometimes eliminate the need for tooth extractions later on.
• Breathing and airway concerns. In some children, a narrow palate can contribute to mouth breathing, snoring or mild sleep-disordered breathing. Expanding the palate can improve nasal airflow and overall breathing patterns.
• Impacted teeth. Sometimes a tooth that should come in on its own is blocked because there is not enough space. Creating room with an expander can allow that tooth to come in naturally.

When is the right time?

Earlier is almost always better when it comes to palatal expansion. The younger your child is, the more flexible the growth plate is, and the more easily the jaw responds to gentle guidance. Most palatal expansion is done between the ages of 7 and 10, though every child develops differently.

This is exactly why the Canadian Association of Orthodontists recommends that children have their first orthodontic assessment by age 7. At that age, your child still has a mix of baby and permanent teeth, but we can already see how the jaw is developing and whether early intervention will be beneficial.

At MacKenzie Orthodontics, all consultations for children are completely free. There is no cost and no obligation to find out whether your child could benefit from early treatment.

Traditional Metal Palatal Expander

If your child’s dentist or a previous orthodontist has mentioned a palatal expander, there is a good chance they were referring to the traditional fixed metal expander, also called a rapid palatal expander or RPE. It is worth understanding how this device works, because it has been the standard approach to palatal expansion for many decades and is still widely used today.

A traditional palatal expander is a metal appliance that is cemented directly onto your child’s upper back teeth. It spans the roof of the mouth and sits against the palate. In the centre of the appliance there is a small metal mechanism with a tiny hole in it called a keyhole. Once or twice a day, a parent or the child inserts a small key into this hole and turns it a precise amount. Each turn creates a small amount of separation at the growth plate in the centre of the palate, which is how the expansion happens gradually over several weeks.

The appliance stays cemented in place throughout the entire expansion period and for several months afterward while new bone fills in the space that has been created. It is not removable, which means it is always working but also means it requires some adjustment in terms of eating, speaking and keeping the area clean.

Many children do very well with traditional expanders and they are a proven, effective treatment. However, parents often ask us about some of the common challenges:

• Activation at home. The daily turning routine can feel daunting for parents, particularly with younger or more anxious children. It requires consistency and a steady hand, and some children find the turning process uncomfortable or stressful.
• Speech and eating. Because the appliance sits against the roof of the mouth, many children notice changes in their speech and find certain foods more difficult to eat, at least in the initial weeks.
• Oral hygiene. Keeping the area around a fixed appliance clean requires extra attention. Food can become trapped under and around the device, and brushing thoroughly takes more time and care.
• The appliance is visible when your child opens their mouth, which some older children and teens find embarrassing.

None of these are reasons to avoid treatment if a traditional expander is the right clinical choice. But they are real considerations, which is part of why we have invested in modern alternatives for appropriate cases.

Learn more on our Palatal Expanders page. Our Treatment for Children (Ages 6-10) and Growth Monitoring pages also have related information.

Angel Kid Aligner System

For children and teens who need mild to moderate expansion, or where dental arch development is the primary goal, Dr. MacKenzie recommends the Angel Kid Aligner System. Angel Kid is part of the Angel Aligner family and uses modern clear aligner technology to guide the growth of the upper jaw gently and precisely.

Because Angel Kid is removable, it is easy for your child to keep clean, and there is no fixed appliance sitting against the roof of the mouth. Children tend to adapt to it very quickly and find it far more comfortable than a traditional cemented expander. There is no key turning at home, no rough metal framework, and nothing bonded to the teeth.

Angel Kid is also used for broader dental arch development, not just expansion, making it a versatile and modern option for growing patients who need more than just widening of the palate.

Invisalign Palatal Expander

For cases that require more significant palatal expansion, or where skeletal expansion is the primary clinical objective, I recommends the Invisalign Palatal Expander. This system is designed specifically for cases where the degree of expansion needed goes beyond what a removable aligner system typically addresses.

The Invisalign Palatal Expander is a highly effective and modern alternative to the traditional fixed metal expander for these more involved cases. It offers greater precision in the amount of expansion achieved, and a significantly more comfortable experience than the older RPE appliances many parents remember from their own childhood.

In both cases, whether we use Angel Kid or the Invisalign Palatal Expander, our goal is the same: to guide your child’s jaw development at the right time, in the right way, so that the next phase of their orthodontic treatment is as simple and effective as possible.

What does the process look like for my child?

This is usually what parents worry about most, and I want to reassure you that it is very easy. It all starts with a 3D scan of the teeth: no messy molds or impressions. At the next appointment your child will receive their expander based on the method that we have chosen together with your family. Modern palatal expanders, particularly the clear aligner-based systems we use, are very well-tolerated by children. There is typically some very mild pressure or awareness in the first few days, but this passes quickly. Most kids don’t even need Advil or Tylenol but feel free to offer it to them. Most children adapt within a week and barely notice they are wearing it.

Orthodontist in Southern New Brunswick

The Canadian Association of Orthodontists recommends a consultation for all kids at age 7. At this age the bones of the palate and lower jaw are still “moldable” and palatal expansion is possible without invasive procedures.  Even if nothing needs to be done right now, you will leave with a clear picture of how your child’s smile is developing and what, if anything, to watch for.

At MacKenzie Orthodontics, we provide early orthodontic assessments and palatal expander treatment for children and teens across Southern New Brunswick, including Saint John, Rothesay, Quispamsis, St. Stephen, and surrounding communities including patients from Northern Maine. Dr. Liliya MacKenzie has been an orthodontist since 2009 and is one of the most experienced clear aligner providers in Atlantic Canada, offering both the Angel Kid Aligner System and the Invisalign Palatal Expander as modern, comfortable alternatives to traditional fixed expanders. All consultations at MacKenzie Orthodontics are completely free for children and adults and include a full set of digital x-rays, clinical photos, a 3D intraoral scan and a personalized smile simulation. If you have questions about your child’s jaw development or would like to find out whether early treatment is right for them, we invite you to book a free consultation at any of our three locations. There is no cost, no obligation, and no referral needed.