Pain can be due to many reasons, normally tooth gets weakened after rct 2.pain can be due to the heavy force during chewing 3.,due to some infection

Pls post an X-ray .. if d tooth is reinfeceted if their is a periapical infection.. .. u have to get a re root canal

It is possible provided it has to be seen clinically and Xray's taken You may Practo Consult me for elaborate details

First of all u haven't mentioned at ur age why was ur root canal done in ur lower front teeth.... was it due to trauma or was it that ur tooth was decayed..... or r ur teeth crowded ..... it can b possible that it's adjacent teeth which is paining nd u feeling the pain in d same tooth which was treated earlier.... so in such cases better u get an x ray done nd den rule out the possibility.... most of the times it's some other teeth nd the pain radiates nd I can't make out exactly which tooth is paining .... so visit a dentist nd get an x ray done