The reason why a tooth still hurts after a root canal filling may be normal, or it may be caused by incomplete treatment, tooth splitting, or infection.
1. Normal phenomenon: when the tooth is treated with root canal therapy, pain may occur when the effect of anesthesia subsides, which is normal.
2. Incomplete treatment: During root canal treatment, if the root canal is not completely filled with missing root canals, or if the root canals are not thoroughly cleaned, pain and aggravation of symptoms may occur.
3. Tooth splitting: If the tooth is not protected by a brace after root canal treatment, the tooth may split when it touches a hard object, resulting in pain.
4. Infection: If the root canal treatment is not completely sterilized, there may be bacteria and other residues in the root canal to reproduce, which may cause pulpitis, apical periodontitis and painful symptoms.
It is recommended to go to the hospital in time to find out the cause and treat it as soon as possible.