Active caries, uncontrolled periodontal inflammation, unstable support, and uncertain endodontic prognosis require phased treatment: disease control, stabilization, provisionalization, reassessment, then definitive care. A risks biologic and restorative failure by bypassing control of infection and prognosis. A preserves reversible options while coordinating periodontal/endodontic decisions and provisional esthetics. A may overtreat before disease control, medical optimization, and informed prognosis review. A finalizes occlusion and prosthesis design on unstable biologic foundations. Diagnose active disease and uncertain abutment prognosis; order needed periodontal/endodontic consultations and records; treat with stabilization and provisional restorations; escalate when systemic or specialty risk affects sequencing.