Hi Doc! Corbin Payne here, USMC on RNR in Manilla. I'm 34, Male. Had a root canal procedure done here, prior to that, I had urticaria and was tested and the docs found nothing. They said the dental infection may be causing the hives. If so, how long after the root canal procedure till my hives clear up? Does the bacteria just leave my system right away or does it take time? Thank you sirs and maams!