hi each tooth is different and each decay and infection vary from less to more so do not compare please just relax and get your treatment done

It is very important to get your root canal completed. If your first sitting experience has been uncomfortable try visiting an Endodontist ( root canal specialist) who are trained to make you very comfortable as they are specialised in root canals. And if pain is the cause make sure you get your treatment done under local anaesthesia.

Tell your dentist to give a local anaesthetic. Normally the pain should decrease once the anesthesia has worked