This was a very calcified maxillary first molar. I wanted to put the EdgeFiles to the test and boy it did not disappoint. I used glide path files to help get to length then used handfiles to size 15. Then, crowned down with the Edgefiles. MB and DB 25/04 and Palatal 40/04. These are one of the most aggressive yet safest files I've ever seen. Kudos Dr. Goodis...You have made us better Root Canal Rockstars! ~ Dr. Rico Short