Crowns and onlays are custom-made restorations used when a tooth needs more protection than a filling can predictably provide. An onlay covers the weakened part of a tooth, while a crown covers most or all of the visible tooth.

Not every damaged tooth needs a crown. We assess how much healthy tooth remains, explain the alternatives and recommend the most conservative option that is likely to work well for you.

When might an onlay or crown be considered?

• A tooth has a large filling or significant loss of structure.
• A tooth is cracked, fractured or heavily worn.
• A root-filled tooth needs additional protection.
• A failing restoration needs to be replaced.
• Shape, function or appearance needs careful rebuilding.

What is the treatment process?

1. Your dentist examines the tooth and may take X-rays, photographs or a scan.
2. We discuss whether a filling, onlay, crown or another option offers the best balance of protection and tooth preservation.
3. The tooth is prepared comfortably with local anaesthetic where appropriate.
4. A digital scan or conventional impression records the tooth for the dental laboratory. A temporary restoration may be fitted.
5. At a later visit, the custom-made restoration is checked for fit, appearance and bite before it is securely bonded or cemented.

Materials and planning

Tooth-coloured zirconia or Emax restorations are available where suitable. The best material depends on the tooth, your bite, the amount of remaining tooth and the appearance required. If you grind or clench your teeth, we may also discuss a protective night guard.

Learn more about composite fillings, or explore our wider restorative dentistry options.

Indicative fees

Tooth-coloured zirconia or Emax onlays and crowns are from £910 privately and from £819 for practice-plan members, per tooth. Fees vary with complexity and laboratory requirements. Examination, X-rays, root canal treatment, core build-ups or other care are separate where required. You will receive a written estimate before treatment.

View our full fee guide

Frequently asked questions

What is the difference between an onlay and a crown?

An onlay replaces and protects the damaged surfaces while leaving more of the natural tooth uncovered. A crown covers most or all of the visible tooth. We recommend the least extensive option that is likely to be reliable.

Does the treatment hurt?

Local anaesthetic is normally used while the tooth is prepared. Some short-term sensitivity or gum tenderness can occur afterwards. We will explain what to expect and how to contact us if you are concerned.

How many appointments are needed?

Many laboratory-made crowns and onlays require a preparation visit and a fitting visit. Additional planning or treatment may be needed for more complex teeth.

How long will a crown or onlay last?

No restoration lasts forever. Longevity depends on the tooth, material, bite forces, cleaning and maintenance. Regular reviews help us identify concerns early.

Does every root-filled tooth need a crown?

No. The recommendation depends on the tooth and how much healthy structure remains. We will explain whether a filling, onlay, crown or monitoring is appropriate.

Clinical review: Reviewed by The Treatment Centre clinical team.