"i am in severe pain. i believe i need 2 root canals.  i went to er and my doctor prescribed tylenol 3. the dosage is 1 every 4 hours. please believe me when i say the pain has not subsided at all. i do not even feel sleepy. even that would be some relief. i contacted the hospital about this and i have to go back to er to be re-evaluated and pay another 800. the earliest i can be seen by my dentist is in another 14 days. "