← All explanationsPost and core

What is a post in a root-filled tooth for?

A post and core can rebuild a heavily damaged, root-filled tooth for a crown. The post lies in a prepared part of the root canal and retains the core. It does not replace the root or automatically make it stronger.

For dental trainees & teams

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The natural root stays

A post is anchored in an existing root-filled tooth. It is not an implant replacing a missing root in bone.

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The core needs retention

If too little tooth tissue remains, a post can retain the core. This does not mean that every root-filled tooth needs a post.

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Remaining tissue matters

Planning considers remaining tooth walls, the root filling and loading. Further dentine removal may weaken the root; a post is no guarantee of greater strength.

Watch the short film Download infographic (German)

At a glance

When is it considered?

In a root-filled tooth when the remaining tissue would not retain a core adequately on its own.

What are the basic steps?

A suitable canal section is prepared, and the post is joined to the core; the restoration is planned around this.

What limits suitability?

Root condition, remaining tissue, cracks and loading, among other factors. The benefit must justify the additional procedural risk.

Knowledge in motion

Explained in 36 seconds.

Three steps. Straight to the point.
Explanations are also shown on screen.

Short film (German): What is a post in a root-filled tooth for?

Open the short film directly: Landscape film (MP4, German) · Portrait film (MP4, German)

Silent film in German · English explanations in the three views above

Often confused

Post and core or implant?

A post uses an existing natural root. An implant is anchored in bone to replace a missing root.

Quick answers

Does every root canal treatment need a post?

No. The key is whether enough tooth tissue remains to retain the core.

Is a post an implant?

No. It lies in the canal of a retained tooth root. An implant replaces a missing root.

Is the entire root filling removed?

No. Only a suitable canal section is prepared for the post; the seal near the root tip must remain intact.

At the practice

For your consultation

A question to discuss with Dr. med. dent. Niusha Barahmand Pour:

Is a post really needed to retain the core, and which tooth tissue will be preserved?

At the practice, the findings, personal wishes and possible next steps are discussed through a consultation and examination.

For heavily damaged teeth, the remaining tissue and restorative options can be assessed.

Discuss tooth preservation optionsChoose an appointment on Doctolib

Meet Dr. med. dent. Niusha Barahmand Pour

Learning for dental trainees & teamsUnderstand clinical terms and build your knowledge

Build on the simple explanation with clinical terms, key distinctions and a knowledge question.

Core: Replacement of missing tooth tissue to provide a foundation for further restoration.
Post retention: Additional retention for the core from a post anchored within the root canal.
Remaining tooth tissue: Natural tissue still present, which is essential to the plan.

Know the difference

The post is intended to retain the core. Preserving sound tooth tissue remains central to strength.

Knowledge questionWhat is a post used for?

This question supports learning. It does not assess personal symptoms.

Automatically strengthening every root.
Retaining the core when too little tooth tissue remains.
Replacing a missing root in bone.

Show answer and explanation

Retaining the core when too little tooth tissue remains.

When indicated, a post retains the core; it does not automatically strengthen the root.

Sources for further learning

Sources and context

Editorial research: 23 October 2026. This explanation covers general principles and does not replace a personal examination. Suitable treatment is discussed following individual assessment.