The outcome in the treatment of furcation defects is often unsatisfactory. The reasons are morphologic and pathologic peculiarities as well as extensive changes in shape caused by resective treatment of periodontal lesions in multi-rooted teeth. Therefore, augmentative strategies are suggested to improve the prognosis. However, the success rate decreases with increasing severity of the disease. In contrast, if the affected roots are not extracted but are extruded after hemi- or trisection, this leads to a coronal displacement of the disease process and a significantly improved situation for hygiene. At the same time, the resection of inflammatory tissue of the periodontal pockets is accompanied by vertical and horizontal bone apposition. The results are predictable and stable in the long term. The burden for the patient is low. ((Quintessence Int 2022;53: 884–891; Originally published (in German) in Quintessenz Zahnmedizin 2020; 71(9): 1024–1032; doi: 10.3290/j.qi.b3418205)