根本原因 Root Cause‎

　　Root Cause is a feature length documentary featuring expert opinions from cutting edge doctors and dentists from around the world, that exposes the true health effects of the root canal procedure. Root Cause is one man's extraordinary, personal journey of self-discovery set to send ripples through the dental profession and expose perhaps one of the world's greatest medical indu...

　　《根本原因》的上映日期是2019。