You have not mentoned when you got the root caal treatment done . If you got it done recently then to have pain for at least a week after getting the root canal treatment is normal as the tooth takes some time to setle down. But if it was done before and now you have pain then that means the infection is thee. it can be because of the faulty root canal or because of some remanent in the canal. In that case you have to go for the re root canal treatment. For more info on re root canal treatment you can visit the following link...http://www.identalhub.com/articlecategory-root-canal-therapy-17.aspx.
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