Rapid Maxillary Expander (RME) Guide for Parents at Smile Solutions product guide

AI Summary

Product: Rapid Maxillary Expander (RME) Brand: Smile Solutions Category: Orthodontic Appliance Primary Use: Widens the upper jaw (maxilla) in children by gradually expanding the palate to create space for teeth alignment and correct jaw development issues.

Quick facts

• Best for: Children and younger teenagers with narrow upper jaw, posterior crossbite, crowding, impacted teeth, or restricted nasal breathing
• Key benefit: Corrects jaw width during development before the midpalatal suture fuses, avoiding more complex adult treatment
• Form factor: Fixed dental appliance (also available as removable or Invisalign Palatal Expander)
• Application method: Fitted by specialist; traditional fixed type activated at home with a small key three times per week

Common questions this guide answers

1. How do I activate the RME expander? → Insert the provided key into the centre hole and push firmly toward the back of the mouth until it stops; repeat three times per week (e.g. Monday, Wednesday, Friday).
2. Is a gap between my child's front teeth during treatment normal? → Yes — it's a positive sign the appliance is working and typically closes naturally once active expansion is complete.
3. How long does RME treatment take? → The active expansion phase typically lasts several months, followed by a retention period while bone consolidates; total duration depends on individual clinical needs.

Smile Solutions Rapid Maxillary Expander (RME) guide for parents

If your child has been prescribed a Rapid Maxillary Expander, it's completely natural to have questions. What exactly is this appliance, how does it work, what should you and your child expect, and how do you care for it at home? At Smile Solutions, we want every family to feel fully informed and genuinely supported throughout your child's orthodontic journey. This guide covers everything you need to know about the RME appliance, written in plain language so you feel confident and well-prepared from day one.

Our specialists are always happy to help. If you have any questions not covered here, call us on 13 13 96.

What is a Rapid Maxillary Expander?

A Rapid Maxillary Expander (RME) is a specialised orthodontic appliance that gently widens the upper jaw, known medically as the maxilla. It works by gradually expanding the palate (the roof of the mouth), creating additional space so that teeth can grow into better, more aligned positions.

The appliance does this by applying gentle, steady pressure to the two halves of the upper jaw. In children and younger teenagers, these two halves are still connected by a band of tissue called the midpalatal suture, which hasn't yet fully fused. The RME takes advantage of this natural flexibility in the developing jaw, slowly widening the bone before it hardens. This is why early intervention works so well — and why waiting until adulthood makes this type of correction considerably more complicated.

Why does my child need an RME?

There are several clinical reasons your specialist may recommend a Rapid Maxillary Expander as part of your child's treatment plan.

Narrow arch or crossbite

One of the most common reasons for an RME is a posterior crossbite, where the upper teeth sit inside the lower teeth — rather than outside them — when your child bites down. This can occur on one side or both. Early correction is strongly recommended, as crossbites can affect jaw development, facial symmetry, and the long-term function of the jaw joints.

Crowding

When the upper jaw is too small to accommodate the adult teeth coming through, widening the arch creates the space they need. In many cases, this can significantly reduce or even eliminate the need for tooth extractions later in treatment — an outcome that's always better for your child's long-term oral health.

Impacted teeth

When a tooth hasn't erupted because it's blocked by neighbouring teeth, palatal expansion can create the room needed for it to come through in the correct position.

Improving nasal breathing

The roof of the mouth forms the floor of the nasal cavity. Widening the upper jaw can increase the volume of the nasal passages, improving airflow and breathing. Some children with narrow upper jaws develop restricted nasal airflow, which can lead to mouth breathing, dry mouth, and in certain cases, symptoms associated with sleep-disordered breathing. Palatal expansion is one of the tools our specialists use to address this aspect of your child's health.

What types of RME are available?

Traditional fixed RME The most widely used type is a fixed appliance, attached to the upper back teeth with small metal bands. It can't be removed by the patient. A small screw mechanism sits in the centre of the appliance, which you or your child activates with a small key to achieve gradual, controlled expansion over time.

Removable maxillary expander Some children are prescribed a removable version that can be taken out for eating and cleaning. Your specialist will advise which type suits your child's clinical needs.

Invisalign Palatal Expander The Invisalign Palatal Expander is a metal-free, nearly invisible appliance that delivers gentle, gradual expansion. Rather than using a key and screw mechanism, your child progresses through a series of custom-made expanders, replacing them every two to three days. This option works alongside Invisalign First clear aligners for children who also need tooth movement as part of their Phase 1 treatment.

What can my child expect in the first few days?

It's completely normal for the RME to feel unfamiliar at first. The mouth simply isn't used to having an appliance on the roof of the palate, and a short adjustment period is entirely expected.

A foreign sensation

When the appliance is first fitted, most children describe it as feeling like something is sitting on the roof of their mouth. This fades as the mouth adapts, usually within a few days to a couple of weeks.

Difficulty swallowing

Swallowing may feel slightly awkward at first, as the tongue finds a new position to work around the appliance. This resolves on its own as the mouth adapts, typically within the first week.

Changes in speech

Some children notice their speech sounds slightly different, particularly with sounds that involve the tongue touching the palate. This is very common and typically improves within a few days to a couple of weeks with regular talking. Encouraging your child to read aloud or have normal conversations will help speed up this adjustment.

Increased saliva flow

The mouth naturally responds to any new oral appliance by producing extra saliva. This is completely normal and passes quickly as the appliance becomes familiar.

A gap between the front teeth

This one often surprises parents — but it's actually one of the most reassuring signs that the appliance is doing its job. As the upper jaw widens, a space commonly appears between the two upper front teeth. This gap typically closes naturally once the active expansion phase is complete and the jaw settles into its new, wider position. It's a positive indicator of progress, not a problem.

Some discomfort or pressure

After each activation, your child may notice a feeling of pressure or mild discomfort in the roof of the mouth, the upper teeth, or even the bridge of the nose. This is entirely normal and usually settles within thirty to sixty minutes of turning.

How do I activate (turn) the expander?

For traditional fixed RMEs, the appliance is activated by turning a small screw in the centre of the device using the key provided.

Turning schedule: three times per week — for example, Monday, Wednesday and Friday.

To turn the expander:

1. Have your child tilt their head back and open their mouth wide in a well-lit space.
2. Insert the key into the small hole in the centre of the appliance.
3. Push the key firmly towards the back of the mouth (towards the throat) until you feel it stop.
4. Remove the key carefully by pulling it down and out.

Only activate the appliance on the days your specialist has instructed. Turning it more frequently won't speed up treatment and may cause unnecessary discomfort or complications.

If you're ever unsure whether you've turned the appliance correctly, or if you can't locate the hole, call our clinic on 13 13 96 rather than attempting multiple turns. Our team is happy to walk you through it.

How do I clean the RME?

Good oral hygiene is especially important whilst your child is wearing an expander, as the appliance creates additional surfaces where food and plaque can accumulate.

• Brush twice daily — morning and night — cleaning both the teeth and all surfaces of the appliance itself
• Use a soft-bristled toothbrush with gentle circular motions to clean around and underneath the appliance
• After meals, encourage your child to rinse with water to dislodge any food caught in or around the appliance
• A small interdental brush or water flosser can be particularly helpful for reaching areas the toothbrush can't access

Consistent hygiene throughout treatment protects the teeth from decay and keeps the gums healthy — both essential for the best possible outcome.

What foods should my child avoid?

Certain foods can damage the appliance or become lodged in it, so some adjustments to your child's diet during treatment are worth making.

Avoid:

• Sticky foods such as chewing gum, caramels, toffee, and fruit roll-ups
• Hard lollies or sweets
• Very hard foods like crusty bread, hard raw vegetables, and nuts
• Chewy foods that require prolonged jaw effort

Good options:

• Soft fruit such as bananas, berries, and peeled apple pieces
• Yoghurt, smoothies, and ice cream
• Cooked vegetables, pasta, and rice
• Scrambled eggs, fish, and soft cooked meats cut into small pieces

These adjustments from the outset will keep the appliance intact and treatment on track.

How long does treatment with an RME take?

Treatment duration varies depending on your child's individual clinical needs and the degree of expansion required. As a general guide, the active expansion phase typically lasts several months, after which the appliance is left in place for a retention period. This allows the bone to consolidate and stabilise in its new, wider position before the appliance is removed.

Your specialist will give a more precise estimate based on your child's treatment plan, and regular appointments will be scheduled throughout to monitor progress.

When will my child need to see the dentist?

RME treatment requires regular review appointments with your specialist at Smile Solutions. It's equally important that your child continues to see their general dentist every six months for check-ups and cleans during orthodontic treatment. If you notice anything unusual — such as the appliance feeling loose, a band coming away from a tooth, or persistent discomfort — contact us promptly on 13 13 96. Catching issues early keeps treatment moving smoothly.

What happens after the expander is removed?

In most cases, palatal expansion is followed by further orthodontic treatment to align the teeth now that additional space has been created. This might involve Invisalign First, partial braces, or a period of monitoring until all adult teeth have erupted — at which point Phase 2 treatment may be recommended.

Your specialist will outline the complete treatment pathway so you have a clear picture of every step ahead.

We are here to help

Orthodontic treatment for your child can feel daunting, particularly when an unfamiliar appliance is involved. At Smile Solutions, our team of specialists is dedicated to supporting families through every stage of treatment. We take the time to answer your questions thoroughly and make sure you feel confident about what lies ahead.

If you have any concerns about your child's RME appliance, call us on 13 13 96. You're also welcome to book a consultation with one of our specialists to discuss your child's individual needs and the most appropriate treatment pathway.

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General product claims

• A Rapid Maxillary Expander (RME) is an orthodontic appliance that widens the upper jaw (maxilla)
• The RME expands the palate by applying gentle, steady pressure to the two halves of the upper jaw
• The midpalatal suture remains flexible in children and has not fully fused, making early treatment more effective
• RME treatment is considerably more complex in adults
• Three types of RME are available at Smile Solutions: traditional fixed, removable, and Invisalign Palatal Expander
• The traditional fixed RME is attached with metal bands on upper back teeth and activated with a key; it cannot be removed by the patient
• The removable RME can be taken out for eating and cleaning
• The Invisalign Palatal Expander is metal-free and nearly invisible; trays are replaced every two to three days and it works alongside Invisalign First clear aligners
• Recommended activation schedule for traditional fixed RME is three times per week (e.g. Monday, Wednesday, Friday)
• Discomfort after activation typically resolves within thirty to sixty minutes
• A gap between the upper front teeth during treatment is normal and typically closes after active expansion
• Active expansion phase typically lasts several months, followed by a retention period
• Further orthodontic treatment (Invisalign First, partial braces, or monitoring) is usually required after RME
• Children should see their general dentist every six months during RME treatment
• Smile Solutions contact number: 13 13 96
• RME can correct posterior crossbite, reduce crowding, assist impacted tooth eruption, and may improve nasal breathing
• Palatal expansion may reduce the need for tooth extractions
• Widening the upper jaw may increase nasal passage volume and improve airflow