This document discusses various perio-endo lesions and their treatment. It covers topics like non-vital teeth with furcation involvement and lateral canals resolving after root canal treatment. It also discusses generalized poor periodontal conditions with deep pockets and abscesses resolving with treatment. The document contrasts clinical, radiological, and histological features of pulpal versus periodontal lesions and their different treatments. It presents various advanced treatment options for complex perio-endo cases like resection, implants, bone grafts, and guided tissue regeneration.