I have pain in a recently root canal treated tooth. Why?

Hi,

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I understand this would be a very painful condition. If it has started with pain so hard inside the crown then infection has definitely occurred. In such cases, re-treatment is done with a very poor prognosis or tooth extraction is done that rules out the cause of infection with 100 % prognosis rate. Things to do right now include taking Ibuprofen 600 mg TDS (thrice a day, that is, eight hourly for three days). Start saline water mouthrinses 4 to 5 times a day. (Take a cup of lukewarm water and add 1/4th teaspoon of salt in it and do its rinses). Do not lay down straight. It will trigger up a toothache. Keep pillows a bit high or some more cushions under your neck while trying to sleep. If only painkiller Ibuprofen does not help much with pain in a day, then you must start with this antibiotic regime as soon as possible. Tablet Augmentin 625 mg BD (twice a day), tablet Gramex (generic: Metronidazole) 400 mg (twice a day), tablet Ibuprofen 600 mg (thrice a day). That is the best regime to be followed in tooth infections provided that you are not allergic to any of such medicines. Hopefully, it will help.