Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain it is true that after Root Canal Treatment if there is pain again after few months or years it is due to re-infection in the tooth and in case if after doing Root canal twice also again pain has started that means there is some defects in the
root canal treatment which is causing re infection and pain..
I would suggest you to consult an Endodontist and get evaluated and in case if there is infection I suppose after an
x Ray you will be advised to get the tooth extracted as it is not responding to Treatment..
As for now you can take anti-inflammatory painkillers like
Ibuprofen for pain relief and
Augmentin 625mg for reducing infection..
Avoid chewing from affected side..
Hope this information helps..
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Thanks and regards..
Dr.Honey Nandwani Arora..