Dens invaginatus is a dental malformation that may give rise to several complications. Caries of the invagination can severely weaken the whole tooth, making it susceptible to fracture. Subgingival fractures are major complications threatening tooth survival and usually require periodontal/orthodontic/prosthetic treatment if long-term viability is to be ensured. This article describes a case of single-session restoration of a fractured invagi-nated tooth by means of endodontic treatment followed by fragment reattachment. Schlagwörter: dens in dente, dens invaginatus, fracture, reattachment, resin cement