1465. Mesial concavity making the prognosis poor for a furcation involvement is present in_____________? September 27, 2025 by Admin A. Maxillary canine B. Maxillary 1st premolar C. Mandibular 1st premolar D. Maxillary 2nd premolar ✅ The correct answer is option B. Maxillary 1st premolar.