What is Inlays & Onlays?

Inlays and onlays are fitted restorations for part of a tooth. An onlay can also cover one or more of the tooth’s raised biting surfaces. These restorations may be considered when a tooth needs a repair that does not cover it completely.

Medically reviewed by Dr. Damini Pranav Mali (BDS, Reg. A-52098), November 2026.

Who it may be for

These restorations may be considered when a tooth needs a repair that does not cover it completely. A consultation decides.

How suitability is assessed

An inlay fits within a tooth’s biting surface; an onlay also covers one or more cusps, the raised points used for chewing. Assessment checks decay, cracks, bite forces and whether enough healthy tooth remains to support the repair.

What happens at the clinic

  1. Assess the tooth

    The amount and condition of remaining tooth structure are reviewed.

  2. Prepare and record

    The tooth is prepared and records are taken for the restoration.

  3. Check the fit

    The restoration and bite are checked before completion.

Options and limitations

A direct repair or a full crown may be alternatives, depending on the size and position of the damage. An inlay or onlay requires tooth preparation and can chip, detach or develop decay at its margins.

Care and follow-up

Keep the edges and spaces between teeth clean. Follow instructions for any temporary restoration and report persistent sensitivity or a loose repair.

Questions you may have

Why consider an onlay instead of a crown?

It may cover damaged biting surfaces while retaining other sound parts of the tooth. Suitability depends on the remaining tooth and bite, rather than the name of the restoration.

Does an onlay need tooth preparation?

Yes. The damaged area is prepared so the restoration fits and has suitable support. The amount depends on the defect.