Q. What can be done for tooth pain that occurs after re-fixing the displaced crown?

Answered by
Dr. Bharat Joshi
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Dec 11, 2021

Hello doctor,

I had got a root canal done, and a crown was placed on the tooth. The crown had fallen off, so when I took the crown to the dentist to fix it, they took an X-ray of the tooth (X-ray is attached below) and said that the tooth is infected again and needs a root canal again. Can the tooth which has already undergone root canal be infected again? If yes, how can it be treated? Do I have to undergo a root canal again? I did not have any pain when the crown fell off, but now, after the crown is fitted again, I have severe pain when I bite on that tooth. Could you please help me with the query?




Welcome to

I had gone through the reports (attachments removed to protect the patient's identity). The tooth can be infected even again after the root canal as there is blood supply in the periodontal ligament. In the X-ray, the distal root of the tooth shows an infection, and the crown is not fully prepared. I suggest you take the following antibiotics; a) Tablet Amoxicillin 500 mg twice a day for five days. b) Tablet Aceclofenac twice a day for five days. Do warm saline rinse for five days. The infection has to be subsided, then only crown preparation and crown placement can be done. After two or three weeks, once the infection is subsided, a temporary crown can be placed to maintain occlusion, and placement of a permanent crown can be done.


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