Palatal expanders, explained for parents

How a palatal expander works

The upper jaw grows as two halves that do not fully fuse until after puberty. An expander sits across the roof of the mouth and applies gentle pressure to the upper molars with each adjustment, encouraging the two halves to grow apart slightly. New bone fills the gap, and the jaw stabilizes in its wider, healthier shape.

What it helps

• Crossbites, where upper teeth bite inside the lower teeth
• Crowding, by creating room without extractions
• Impacted teeth that need space to erupt
• Narrow airways: widening the palate widens the nasal floor, which can improve breathing

What it feels like

Expect a few days of pressure near the nose and extra saliva, plus a temporary lisp. Most kids adapt within a week. Turns are done at home with a small key, and we show you exactly how. Expansion typically takes a few weeks, followed by a holding period while the new bone matures.

Dr. Jacqui Payne's continuing education includes MARPE (miniscrew-assisted rapid palatal expansion), an option for older teens and adults whose growth has finished.