On Wednesday l had a double root canal (top left and right molars). Right one is fine. Left one hurts, left side of face signficantly swollen, and left lip is drooping. Have been on antibiotics since Friday. Swelling and lip droop occurred today (Sunday) so bad that l thought l was having a stroke.
Hello, Thanks for consulting Chat Doctor, Read your query, as you have undergone root canal treatment now you have swelling and pain this can be due to infection is still present at apex of root, Chat Doctor.  I will suggest you to consult your dentist for swelling and pain in act treated tooth, complete your Root canal treatment and avoid chewing food from that side, In meantime you can Do warm saline rinses. Hope it will help you. Wishing you good health. Regards,