Root canal file system and use method thereof

The invention relates to the technical field of dental instruments, in particular to a root canal file system and a using method thereof.The system comprises a first root canal file, a second root canal file, a third root canal file and a fourth root canal file; each of the first root canal file, the second root canal file, the third root canal file and the fourth root canal file comprises a smooth rod and a blade part integrally connected with the smooth rod; the first root canal file is an opening file with the section of a cutting edge portion in a convex triangle shape, the second root canal file is a channel file with the section of the cutting edge portion in an inclined crossed S shape, and the third root canal file is a variable cone file with the section of the cutting edge portion in an inclined crossed S shape and with multiple sections of conicity. And the fourth root canal file is a forming file of which the cross section of a cutting edge part is a convex triangle. By means of the arrangement, l