Premier RC-Prep. For chemo-mechanical preparation of root canals. Over 40 years of clinical use and numerous publications demonstrate the clinical efficacy of RC-Prep for chemo-mechanical preparation of root canals. RC-Preps unique formulation of glycol, urea peroxide and EDTA in a special, water-soluble base helps remove calcifications and lubricates the canal to permit more efficient instrumentation. Whether you prefer finger or engine-driven instruments, RC-Prep allows reamers and files to move easily without binding. RC-Prep is also excellent for use with apex locators as it permits consistently reliable readings.