I have had a bad tooth ache all week. Thought I needed a root canal. Went to the dentist he thought maybe I had a high part on my crown and sanded a part off yesterday. Today hurts more, underneath my jaw very sore, very sensitive if I bite down. I have been taking ibuprofen, every 4 hours, still a lot of pain. I have some old pain medicine, from a previous root canal. The medicine is hydroco/apap 7.5-500 tab from 5/25/2011. It says it expires 5/25/12. Is it still effective? Should I just continue the ibuprofen?