← All explanationsPalatal expansion

What is widened during palatal expansion?

Palatal expansion is an orthodontic treatment for a narrow upper jaw. A selected appliance applies controlled forces. Growth, age, bone anatomy and the bite determine the approach; adults may need different anchorage or surgical assistance.

For training & practice ↓

Photorealistic teaching model of a fixed upper-jaw expander with a central screw and anchors. Focus: Central expansion screw. — Example of an upper-jaw expander. Not activation instructions or a depiction of achieved expansion.

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Assess the width

A narrow upper jaw may be associated with a posterior crossbite. Crowding alone does not establish the need for expansion.

02 / 03

Apply appropriate forces

Tooth-borne and bone-anchored appliances have different uses. Activation and review follow the individual orthodontic plan.

03 / 03

Allow stabilization

An active expansion phase is followed by stabilization. Its form and duration are monitored; adjusting the appliance without instructions can cause harm.

Watch the short explanation ↓

At a glance

Aim?

Treat a narrow upper jaw.

For all crowding?

No.

Who plans it?

Orthodontic assessment determines the approach.

Knowledge in motion

Explained in 36 seconds.

Three steps. No audio.
Each scene can also be selected manually.

Silent educational film with German on-screen text and simplified teaching images. Not a patient case or a promised treatment outcome. The full English explanation is available below.

Read the film text in English

Assess the width
A narrow upper jaw may be associated with a posterior crossbite. Crowding alone does not establish the need for expansion.
Apply appropriate forces
Tooth-borne and bone-anchored appliances have different uses. Activation and review follow the individual orthodontic plan.
Allow stabilization
An active expansion phase is followed by stabilization. Its form and duration are monitored; adjusting the appliance without instructions can cause harm.

Often confused

Dental arch width and skeletal expansion

Teeth can move within anatomical limits. Skeletal expansion targets the upper-jaw base; these are not equivalent changes.

Quick answers

Is it only possible in children?

No. Maturity changes the conditions. Adults may need a different or combined approach.

Can an aligner achieve the same change?

Not automatically. Moving teeth and expanding the bony upper-jaw base are different objectives.

Will it reliably treat mouth breathing or sleep apnoea?

That cannot be promised. Breathing or sleep problems require their own medical assessment.

At the practice

For a personal discussion

Editorially suggested question to discuss with Dr Niusha Barahmand Pour:

Does my finding concern tooth positions or the width of the bony jaw base?

Questions about a narrow upper jaw can be a starting point for discussing appropriate specialist assessment.

Discuss jaw width and the biteAppointment selection at Doctolib

Meet Dr. Niusha Barahmand Pour ↗

Learning layer for training & practiceUnderstand terminology and deepen knowledge

Midpalatal suture: The central joint between the palatal parts of the upper jaw.
Skeletal: Relating to the bony jaws.
Retention: Stabilization after active change.

Make the distinction

Teeth can move within anatomical limits. Skeletal expansion targets the upper-jaw base; these are not equivalent changes.

Knowledge questionWhat determines the approach?

For learning, not for assessing personal symptoms. Your answer is not stored or sent.

Findings, growth and anatomical conditions.
Only a wish for straight teeth.
A mirror measurement at home.

View answer

Findings, growth and anatomical conditions.

Selection requires orthodontic assessment.

Sources and context

Editorial research: 2026-11-02. General information, not an individual diagnosis or treatment recommendation. Teaching illustrations are simplified and do not depict a patient case.