What is success rate for root canal re-treatment on a premolar? how long does re-treat procedure usually take? are antibiotics given & for how long?

Good: The success rate for re-treatment of root canal on a premolar is pretty good in the right hands. Antibiotics are given.

75% - 80%: The root canal re-treatment is identical procedure to the original root canal treatment. The success rate for a root canal re-treatment runs at around 75% - 80%. The root canal re-treatment is usually performed by an endodontist. Find an endodontist in your area. Good luck.