When placing a post in an endodontically treated multi-rooted tooth, which root canal should generally receive the post?

The post is placed in the largest, straightest canal to maximize length and retention while minimizing perforation risk: the palatal root in maxillary molars and the distal root in mandibular molars.Other options: Mesiobuccal and narrow curved canals risk perforation and provide poor retention; canal selection is not arbitrary.Key exam takeaway: Post placement: choose the widest, straightest canal (maxillary = palatal; mandibular = distal).