First of all, if root canal performed teeth was painless for minimum 6 months, and u get pain later, that infection can be solved with normal antibiotics course. No need for re root canal. Take these tablets
Acecloplus
Mox 250 DT
Flagyl 400
All 3 , twice a day, for 5 days.
Next Steps
if still pain is there in that teeth, it will give problem ,even after re root canal.. in that case, it's better go with teeth removal. ,
Health Tips
if that teeth was giving pain within a month, then root canal done might be faulty..