Aligners No Longer Fit: What to Watch For

My aligners no longer fit. What should I watch for?

An aligner that no longer fits as it did can mean the teeth have moved, the

device has changed, or the plan no longer matches the current state. Do

not force a device into place. The next step is an assessment by a

practitioner registered with the Dental Council of New Zealand.

What can this page establish, and what can't it?

This page lists general warning signs. It cannot diagnose why your device

does not fit or tell you what to do with it.

Warning signs to escalate

• A device that will not seat onto the teeth.
• Pain, pressure, or soreness that does not settle.
• Teeth that are visibly moving in an unplanned way.
• Damage to the device or to teeth.

Take the device and any records you have to a registered practitioner.

Uncomfortable or poorly fitting devices are a reason to seek care, not to

push through.

Source: Dental Council of New Zealand

(https://dcnz.org.nz/)

Sources checked: 2026-08-11

_The Aligner Guide editorial team. Editorially checked against cited

sources; not clinically reviewed._

This page provides general information, not diagnosis or treatment

advice. For advice about your circumstances, consult an oral-health

practitioner registered with the Dental Council of New Zealand.