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Is a canker sore behind my molar a sign of an infection?

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

Patient's Query

Hello doctor,

I have a canker sore behind my last molar on the bottom right side. I have had pain in the region for a couple of weeks. My wisdom teeth have not been taken out. I have intense pain while chewing hard foods or when the food touches the sore.

I went to the dentist five months ago, and she said my wisdom teeth are not impacted. However, I am worried it might be an infection. I am currently taking Propranolol 20 mg and Lexapro 10 mg.

Please help.

Thank you.

Answered by Dr. Naveen Thomas

Education:

BDS

Professional Bio:

Dr. Naveen Thomas is an expert in Dentistry. He is experienced and well-versed in all treatment modalities of Dentistry.

This doctor is not available for online consultations on the platform anymore.

Hello,

Welcome to icliniq.com.

I have read your query, and I can understand your concern.

It is not a canker sore, but your upper last molar seems to be hitting the gums where the wisdom tooth is coming out. You need to ask your dentist to trim the upper tooth's sharp cusp so that it does not impinge on the gums below.

This condition occurs when the wisdom tooth from below also begins to erupt outside. It helps in breaking up the thick gums to allow the lower wisdom tooth to come out fast. If an X-ray was taken and the wisdom tooth seems to be impacted, then it has to be extracted. Use a saltwater gargle three times a day along with a local anesthetic gel many times a day to provide relief.

I hope this information will help you.

Thank you.

Answered by
Medically reviewed by iCliniq medical review team
Published At September 19, 2023
Reviewed At January 7, 2026

Education:

BDS

Professional Bio:

Dr. Naveen Thomas is an expert in Dentistry. He is experienced and well-versed in all treatment modalities of Dentistry.

This doctor is not available for online consultations on the platform anymore.

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

Dr. Naveen Thomas

Dentistry

Education:

BDS

Professional Bio:

Dr. Naveen Thomas is an expert in Dentistry. He is experienced and well-versed in all treatment modalities of Dentistry.

This doctor is not available for online consultations on the platform anymore.

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