The last 3 days I have been horrible throbbing tooth pain in my left front tooth and the tooth right next to it where I had a root canal done one year ago was also hurting. I went today to a local dentist and did xrays and said the old root canal needs to be fixed and the tooth giving me excruciating pain also needs a root canal so I'm scheduled for next Thursday for both teeth. I was given 300mg of clindamycin and Tylenol 3 with codeine. So my question is how long will it take for the antibiotic to start giving me some relief? And i handle pain pretty well but i'am getting no relief from the Tylenol 3. So does that take a while to work or should I call my dentist tomorrow and let her know I'm not getting any relief? And i'am unable to take any NSAIDS as I'am highly allergic to them. I forgot to mention the tooth without the root canal is infected. I would appreciate any advice I could get!! Thanks!!!