I had a root canal on a upper molar which had a crown. I was on antibiotic. The endodontist went through the crown and when done put a temporary filling.  This was on a Thurs.  unfortunately, I went into the hosp on Sunday.  I had intravenous IV.  After a week I returned to endo my gums were inflamed.  He asked me to wait another week which I did.  When I returned I was experiencing severe pain in the gum close to my cheek bone.  He asked me to use peridex for another week.  I did.  After another visit, he said he thought it was my trigeminal nerve and I should see a neurologist.  Now another week later I am sensitive to heat.
Hello, Thanks for consulting Chat Doctor. Read your query, as you have severe pain in gum this can be due to presence of pain in Act treated tooth due to presence of infection at apex of root, formation of periodontal pocket in tooth, or due to inflammation in periodontal ligament, or it can be to trigeminal neuralgia also. I will suggest you to consult oral medicine and radiologist specialist and go for examination and X-ray of painful region of gum to rule out the cause of pain. Hope this will help you. Wishing you good health. Regards,