First estalish a glide path
Probe the canal by using K file, No.10#,15#
Use Sx enlarge the canal continued by S1
Use 15#hand file to probe the working length
Use S1 file to working length
Use S2 file to working length
Use F1 file to working length
Use F2file to working length
Use F3 file to working length(alternative when it need)
