Creating space by widening the jaw itself.
When the upper jaw is too narrow, a palatal expander widens it gradually — correcting crossbites, relieving crowding, and making room for developing teeth at the stage when it is easiest to do so.
Widening the jaw from the inside.
Custom-fitted appliance
A palatal expander is custom-made from digital impressions of your child's teeth. It sits across the roof of the mouth and is bonded to the upper molars so it cannot be removed during treatment.
Activation with a key
A small key is inserted into the expander and turned a quarter-rotation at each activation. This is done at home, following a schedule set by Dr Denize. Each turn creates a small amount of pressure that gradually separates the two halves of the palatal suture.
New bone fills the gap
As the suture is separated, the body lays down new bone in the space created. During active expansion, a small gap may appear between the upper front teeth — this is expected and resolves as the bone consolidates.
Consolidation period
Once the target expansion is reached, the appliance is left in place for several months while new bone matures and stabilises. Dr Denize monitors progress at regular appointments at our Claremont practice before the expander is removed.
Timing matters more than most parents realise.
The mid-palatal suture in children is not yet fused, which is what makes expansion possible with a non-surgical appliance. Once the suture fuses in the mid-teenage years, widening the jaw becomes a surgical procedure. An early assessment at our Claremont practice can determine whether expansion is indicated — and whether now is the right time.
Conditions where expansion helps most.
Palatal expansion is not a routine part of every child's treatment. Dr Denize recommends it when there is a clinical reason — not as a precaution. Many Perth families from Nedlands, Cottesloe, Dalkeith, and surrounding suburbs visit us for a second opinion on whether expansion is truly needed.
Daily or twice-daily key turns until the target expansion is reached. Followed by a longer consolidation period.
The expander stays in place during the consolidation phase to allow new bone to mature before removal.
Most effective before the palatal suture fuses. Earlier assessment allows better planning of timing.
Frequently asked questions about palatal expanders.
At what age is a palatal expander most effective?
Palatal expanders work most predictably in children and adolescents before the mid-palatal suture fuses, typically before the mid-teenage years. The ideal window varies by individual skeletal development. Dr Denize will assess your child's records at our Claremont practice and advise whether expansion is indicated and whether the timing is right.
How does a palatal expander feel to wear?
Most children adapt to a palatal expander within a week. Speech may be slightly affected initially and eating may feel different, but these usually normalise quickly. Some patients notice a gap appearing between the upper front teeth during expansion — this is expected and closes naturally once expansion is complete.
How long does palatal expansion take?
The active expansion phase typically takes 3 to 6 months, followed by a consolidation period of 6 to 12 months while new bone stabilises in the expanded arch. The appliance is usually left in place throughout both phases. Dr Denize will monitor progress at regular appointments at our Stirling Highway practice in Claremont.
Is palatal expansion painful?
Most children describe a feeling of pressure after each activation rather than sharp pain. Over-the-counter pain relief is usually sufficient for any discomfort in the first day or two after turning the key. The discomfort typically eases within a few hours.
Can adults have palatal expansion?
In adults, the mid-palatal suture has fused, which limits the effectiveness of conventional palatal expanders. Surgical-assisted expansion (SARPE) is an option for adults requiring significant jaw widening, and is carried out in conjunction with an oral and maxillofacial surgeon. Dr Denize can advise whether this is relevant for your case during a consultation at our Claremont practice.
Is your child ready for an assessment?
The Australian Society of Orthodontists recommends an orthodontic check by age 8–10. Early assessment doesn't mean early treatment — it means informed decisions at the right time.