Prosthodontics (Crowns, Bridges & Dentures)
Post & core / build-up
A support built inside a root-treated tooth to hold a crown securely.
Purpose
Support a crown
Visit
Usually one
Anaesthetic
Local
Used after
Root canal
Overview
When a tooth has little structure left after decay or root canal treatment, a post and core rebuilds a solid base. A post sits in the root canal and a core forms the shape for a crown.
It does not strengthen the root itself but gives the crown something firm to grip. It is usually done as part of restoring a heavily damaged tooth.
What to know
- Rebuilds a tooth with little structure left
- Anchors a crown to a root-treated tooth
- Post sits in the canal; core shapes the top
- Usually done under local anaesthetic
Common questions
Why is a post needed?
When too little tooth remains, the post gives the crown a firm base to hold onto.
Does a post strengthen the tooth?
No, it mainly retains the crown; the root can still be more brittle than a natural tooth.
Is the procedure painful?
The tooth is usually already root-treated and numbed, so it is generally comfortable.
What is the core made from?
Often a tooth-coloured filling material or metal, shaped to support the crown.
Can a post come loose?
Rarely it can, especially under heavy bite force, and may need re-cementing or review.
Related topics
Dental crown
A custom cap that covers and protects a damaged or weakened tooth.
Root canal treatment
Treatment that saves a tooth by removing infected or damaged tissue inside it.
Cracked tooth & the nerve
How a cracked tooth can irritate the nerve and what can be done about it.
Caring for new & temporary restorations
How to protect new fillings, crowns and temporary work while they settle.
Dr Rick Iskandar · Reviewed June 2026