Root canals are usually painful for about 1 to 3 days after the second seal, but the exact amount of time will vary from person to person. The second sealing medication after root canal treatment may be inactivator or calcium hydroxide paste, inactivator in contact with the pulp to make it congested and necrotic, a slight pain is normal. While sealing calcium hydroxide paste after pulp extraction, the tissue is stimulated by the drug will produce pain, may be mild pain for 1~3 days, due to the existence of individual variability, so the exact duration of pain will also vary. Note that root canal treatment should be done by eating soft food and avoiding chewing with the affected side, as well as not poking the filling repeatedly with a toothpick or dental floss to avoid dislodging the filling material. If large chunks of filling material fall out, follow up as soon as possible and reseal with medication. It is recommended that you follow your doctor’s instructions for follow-up appointments during root canal treatment and seek medical attention if you experience severe pain.