Dear friend.
Thanks for sharing your concern.
A successful
root canal will never cause pain,because there is no
nerve left in the tooth to cause pain.
The surrounding structure might cause mild irritation for two to three days but not an actual pain.
If you are experiencing constant pain in the RC treated tooth,then you must visit your
dentist and check clinically if any canal is left unexplored?
Also the swelling indicates periapical infection.
An
x ray is required to see the periapical pathology.The
abscess which has developed in your cheek, should be further drained and antibiotic coverage should be given.
I would also suggest you to re check about the duration of antibiotic,as the course you have mentioned is very long.
Generally it is given for 3 to 5 days.
Hope this information helps you.
for further query contact me through my profile.
thanks