The first thing that you should do is to get a proper clinical examination done by a dentist to evaluate the reason for the pain that you are experiencing...... the right treatment can be advised after the right diagnosis has been made.....
The various reasons for this pain can be improperly done root canal treatment which has become reinfected now, fracture of the tooth because of absence of a cap or localised gum infection or inflammation.....
You should get the X ray done again and then retreatment root canal will be done. .to remove the infection. . After the permanent filling go for a crown(cap). Antibiotics and analgesics will have to be started before the repeat root canal. .Visit the dentist at the earliest. .
You can use an analgesic as a pain reliever as of now, it could be due to reinfection as the crown has not been done the possibility of previous filling coming out and getting reinfection is high visit a dentist for a proper treatment plan as it will not be possible to judge only with the history
After root canal your tooth will be non vital and will loose its blood supply and become weak. This is reason why dentist advise to go for root canal followed by coronal coverage ( crown/onlay).As you are having pain now,there are chances of reinfection/fracture of same tooth. So consult to your nearby dentist soon.
As you have not mentioned how much time has been passed,it's difficult to judge the cause behind the pain, but you should visit your dentist as soon as possible,get your Xray done,if its needed crown go for it,it might needed re-treatment go for it also...
Visit your dentist to check the cause of pain. Right now it is difficult to tell whether it is of reinfection or the pocket.
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