I had a filling on my right lower molar three months back. Three days ago I developed a throbbing sharp pain lasting for up to a minute with various spells. The pain used to vanish immediately after putting water in mouth and aggravated by hot food and liquids.I rushed to orthodontist yesterday . He took an X-ray which was not conclusive for root canal therefore he opened my tooth drilled and cleaned it and put the temporary filling. Since than I am managing pain with ibrufen prescribed. Though the pain is not throbbing but is persistent with inflammation. Please advice if I need root canal or the tooth is yet to heal after procedure of filling if so when will I come to know whether I need root canal?