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When does a tooth infection show up on an X-ray?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

Last Saturday, I was feeling some discomfort with one of my teeth. It is a tooth that has a crown on it. I was chewing on a piece of steak, and it felt sore. It felt a little sore on Saturday, Sunday, Monday, and Tuesday.

I saw my dentist on Tuesday, and they did not see anything wrong on the X-ray, but when she tapped the tooth with one of her instruments, it felt a little sore. So, she made me an appointment with an endodontist for a root canal on Friday.

Well, now my tooth no longer feels sore or hurt. If there was a problem with the roots of my tooth, would it not show up on an X-ray? I am not sure what to do now.

Kindly help.

Answered by Dr. Naveen Thomas

Hi,

Welcome to icliniq.com.

Sometimes, it takes time for an abscess to show on the X-ray, but pain starts as soon as it starts producing pus. When the quantity of pus increases and causes bone loss at the root apex, it starts showing on the X-ray. If tapping causes pain, then the tooth does need root canal treatment.

I hope this helps.

Thank you.

Answered by

Dr. Naveen Thomas

Medically reviewed byiCliniq medical review team

Published At March 16, 2018
Reviewed AtAugust 25, 2025

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Naveen Thomas

Dr. Naveen Thomas

Dentistry

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