"This is the peer reviewed version of the following article: Nibali L, Krajewski A, Donos N, et al. The effect of furcation involvement on tooth loss in a population without regular periodontal therapy. J Clin Periodontol. 2017;00:1–9 which has been published in final form at https://doi.org/10.1111/jcpe.12756 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."