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Rare diseases · Sign or symptom

Double tooth

Conjoined teeth

HP:0011089

What it means

Fusion of two adjacent teeth.

The fusion can be complete or be limited to the crown or the root. Typically, incisors and canines form double teeth. Double teeth are more common in the deciduous dentition and rare in the permanent dentition. Double teeth encompasses fusion, concrescence, and gemination of teeth, which some authors describe with the twinning.

Part of the broader category

Abnormal dental morphology

Also called: Teeth, double · Twinning tooth

Double tooth

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This page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.