← All explanationsCaries arrest

What does it mean when decay stops progressing?

Caries arrest means a lesion has become inactive and is not currently progressing. This does not regrow missing tooth shape. A dental assessment determines activity and appropriate management.

For training & practice ↓

Chewing-surface model with a persistent visible stained groove; colour is not used to determine activity. — Unchanged teaching image · activity cannot be established from a photograph

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Distinguish activity

A lesion may be active or inactive. Colour alone does not decide which.

02 / 03

Change conditions

Biofilm control, less frequent sugar exposure and suitable fluoride measures can help. Further measures depend on site and surface condition.

03 / 03

Monitor stability

Inactive does not mean finished forever. The lesion and its cleanability are reassessed at agreed reviews.

Watch the short explanation ↓

At a glance

What stops?

Current progression.

Does a cavity regrow?

Not through arrest.

What still matters?

Cleaning and monitoring.

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

Distinguish activity
A lesion may be active or inactive. Colour alone does not decide which.
Change conditions
Biofilm control, less frequent sugar exposure and suitable fluoride measures can help. Further measures depend on site and surface condition.
Monitor stability
Inactive does not mean finished forever. The lesion and its cleanability are reassessed at agreed reviews.

Often confused

Arrest versus restoration

Arrest describes disease activity; restoration replaces missing tooth form.

Quick answers

Does a cavity close again?

No. Arrest does not automatically replace a structural defect.

Must every inactive lesion be filled?

Not automatically. Function, cleanability and extent influence the decision.

Can it reactivate?

Yes. If conditions become unfavourable, a lesion can progress again.

At the practice

For a personal discussion

Editorially suggested question to discuss with Dr Niusha Barahmand Pour:

Which findings show whether this lesion is active?

We can explain whether a finding needs treatment or monitoring and which home-care steps are useful.

Discuss caries activityAppointment selection at Doctolib

Meet Dr. Niusha Barahmand Pour ↗

Learning layer for training & practiceUnderstand terminology and deepen knowledge

Active lesion: A lesion with clinical signs of current caries activity; its course is assessed in context.
Inactive lesion: A carious change not currently progressing.
Monitoring: Planned follow-up assessment.

Make the distinction

Arrest describes disease activity; restoration replaces missing tooth form.

Knowledge questionWhat does arrested caries mean?

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

The process is currently inactive.
The tooth has regrown completely.
Reviews are never needed again.

View answer

The process is currently inactive.

Disease activity and missing structure are separate issues.

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.