An unusual case of furcation external resorption

Aim To describe the presentation and management of an unusual external root resorption. Summary An unusual external inflammatory root resorption presented in the furcation of a mandibular first molar. Review of earlier radiographs suggested that the lesion was non‐progressive. Occlusal trauma associated with anterior open bite was the most likely aetiological factor. No active treatment was prescribed. Key learning points•  External resorption may occur following loss of the external root surface. •  Occlusal trauma may be a propagating stimulus for progressive resorption. •  Lesions may sometimes be non‐progressive, and treatment may therefore be more damaging than observation.