One year after root canal treatment, the tooth is now very painful, probably because of residual pulpitis, and it is necessary to carry out root canal re-treatment, to re-prepare the root canal and disinfect the root canal, to completely remove microorganisms in the root canal system and to tightly fill and seal the dead space, as described below.
The steps of root canal retreatment are as follows: firstly, access to the pulp chamber should be established, the filling material of the pulp chamber should be removed, the entrance of the root canal should be established, then the cement and sealant should be removed, the root canal should be reprepared, the necrotic pulpal tissues should be completely removed, the root canal should be mechanically prepared, reshaped and chemically sterilized, and finally the root canal should be tightly filled.
It is recommended to visit a regular medical institution to receive professional treatment.