Below listed are the few main reasons that can long last the pain of root canal for more that 4 - 5 days.
1) Cement or Air Forced Through the Root Tip
It’s possible to overfill a root canal with dental cement, causing a bit of the material to ooze out of the root tip. Whether this causes any pain depends on the precise filling material used, how much escapes and where it goes. If the root tip itself was infected before the root canal, there’s probably room for a little excess cement and you’ll never know it was overfilled. If the tooth was not infected around the tip of the root, that’s when overfilling is likely to cause pain after a root canal. It’s rare, but a tiny bubble of air can also be forced out of the root tip, causing pressure and pain. It may take some time, but the pain in either case should subside on its own.
2) Oversized Filling or Crown
If the final filling or crown is even a fraction too big, it hits the opposite tooth with too much force compared to surrounding teeth, which can cause pain after a root canal. Fortunately, this is an easy fix. The dentist simply needs to adjust the filling or crown to remove the high spot on the tooth, though the pain may still linger for three to five days.
3) Sodium Hypochlorite Leak
During a root canal treatment, the dentist washes the tooth roots with sodium hypochlorite, a solution that kills bacteria, dissolves any remaining nerve tissue and washes away the slurry that accumulates during the process. In rare cases, some solution can leak out of the root tip, causing immediate pain, even with the area still numb. After the dentist flushes and dresses the area, you may need to take antibiotics and painkillers for a few weeks until the pain subsides.
4) Missed Canal
Teeth have several canals and some of them are difficult to detect, especially in molars. It’s possible a dentist may overlook an infected canal, leaving a bit of nerve inside the tooth or a small pocket for bacteria to form an infection. If a nerve is left behind, your tooth will remain sensitive to hot and cold as it was before the procedure. If bacteria are causing an infection, the tooth will be sensitive to pressure. Sometimes, the spaces left for bacteria to reside in are microscopic and found in the very tip of the root.
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