I had a root canal done on tooth #12 May 2015. I developed a fistula on my upper gum. The dentist & endodontist fed a wire to see where the infection was coming from and it went straight through my tooth as seen on xray. I'm worried if I pay 900 it will fail again and if I have to pull it I won't have money to replace the tooth with a bridge or partial. Can anyone give me advice? I have included xrays from my visit this week. Thank you