What does a palate expander do?

Photo: Ian Furst, via Wikimedia Commons, CC BY-SA 4.0 (cropped).

The short answer

A palate expander widens the upper jaw. The American Association of Orthodontists describes it as an appliance that sits across the roof of the mouth, called the palate, and attaches to the upper back teeth. It works a bit like braces do: gentle pressure, increased gradually, guides the teeth and jaw toward where they should be.

The AAO also says two things most parents are glad to hear. An expander is a simple, common step, not something to fear. And not every child needs one.

Why an orthodontist might suggest one

The AAO lists four main reasons an expander gets recommended.

• A crossbite. Some upper teeth sit inside the lower teeth when your child bites down. Widening the upper jaw can correct it.
• Crowding. A narrow upper jaw may not have room for every tooth. Expansion makes space.
• A tooth that can’t come in. A narrow jaw can block a permanent tooth from erupting where it should.
• Breathing. The AAO notes that an expander is sometimes prescribed when a child has trouble breathing, because widening the palate also widens the floor of the nose, which may help airflow.

Crossbites get extra attention, and for good reason. The AAO explains that a crossbite left alone can lead to a shifted jaw, uneven jaw growth, and abnormal wear on the teeth. Researchers have studied this closely. A Cochrane review that pulled together 31 randomized trials found that for children aged 7 to 11, both a common fixed expander and a removable expansion plate corrected crossbites in the back teeth more often than simply waiting.

Why timing matters

Expanders are used most often in growing children and young teens. The AAO points out that the face and jaws are still developing in childhood, and that is when this kind of correction tends to work well. Orthodontists weigh age, skeletal maturity, and sex when choosing the moment, since girls usually finish growing sooner than boys.

That is part of why the AAO recommends a first visit with an orthodontist by age 7. By then, many children have enough permanent teeth for an orthodontist to see how the bite is developing. The AAO says those first visits usually end one of three ways: no treatment needed, keep watching as your child grows, or a developing problem that suits early treatment. An expander is one example of early treatment, which you may also hear called Phase 1.

Adults ask about this too. The AAO says some adults may be candidates for expansion, but the approach is different from treatment for a growing child.

Fixed or removable

There are two broad kinds. A fixed expander stays in all the time. Depending on the design, either you widen it a little at home on a set schedule, or the orthodontist adjusts it at visits. Some fixed designs use built-in springs or wires and need no turning at all. A removable expander is a custom plate that comes out for eating and cleaning.

How long it stays in varies. The AAO describes a common pattern: the expander is adjusted over a period of weeks, then held in place longer so the jaw can settle. After that comes the next stage, often braces or clear aligners. Your child’s orthodontist will give you the specific timeline.

What the first weeks feel like

According to the AAO, expect pressure, a full feeling, or mild tenderness, mostly at the start and after adjustments. Speech can sound a little different for a while, and your child may notice extra saliva. These usually ease as the mouth gets used to the appliance, and most kids describe pressure or mild soreness rather than sharp pain. If discomfort is severe or doesn’t let up, call the orthodontist’s office.

A few habits help:

• Start soft. Begin with softer foods. Sticky or hard foods are tough to manage and can damage the appliance.
• Clean around it. Food likes to hide around an expander, so brush carefully. Some families find a water flosser useful.
• Keep the visits. Regular check-ins let the orthodontist confirm the expander is doing its job.

Good questions to bring

If an expander is on the table, these are worth asking: Which problem is it meant to fix? Is it fixed or removable, and who adjusts it? What comes after it? And what should you do if it feels loose or sore between visits?

Ready for a straight answer?

If you are wondering whether your child needs an expander, the place to start is a consultation. A consultation at Beeline Orthodontics is free, and it includes an exam, photos, a digital scan, and a treatment plan with an exact, all-inclusive fee in writing. It is a consultation, not treatment, and every case is planned by Dr. Tim Glesener, orthodontist. Make a beeline for our consultation request form, or call or text (704) 912-5234.

Sources

• American Association of Orthodontists, What is a palatal expander, and what is it used for?
• American Association of Orthodontists, Understanding crossbites
• American Association of Orthodontists, What are the benefits of early orthodontic treatment?
• Ugolini et al., Orthodontic treatment for posterior crossbites, Cochrane Database of Systematic Reviews, 2021