Q. Why is the lower left side tooth sensitive to hot water after root canal treatment?

Answered by
Dr. Bharat Joshi
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Dec 12, 2021 and last reviewed on: Dec 22, 2022

Hi doctor,

I had a pulp infection and went for root canal treatment for a lower left side tooth before three to four days. The procedure was done well and the pain in my tooth is all gone. However, since yesterday the root canal treated tooth became sensitive to hot water though I did not have this symptom during the time when it was infected and before root canal was done. In summary before root canal, tooth was very painful but no sensitivity to hot water. After root canal, pain was all gone but now sensitive to hot water. I would like to know why this happens.

Please answer.



Welcome to

There is always a post-operative sensitivity after an RCT (Root canal treatment). There are many reasons for that, including a post-operative infection, trauma during eating, or dislodgement of temporary restoration, and the most probable being a biting pressure. I would suggest an X-ray of the affected tooth and antibiotics (tablet Amoxicillin 500 mg) thrice a day for three days, tablet Acelofenac (painkiller), and desensitizing toothpaste that needs to be applied on the tooth for one month.

Kindly update me if you do not have any relief.

Take care.

Hi doctor,

Thank you for answering. I am attaching a photograph of the treated tooth. Sorry that it is quite blurry.



Welcome back to

I have seen the photographs (attachments removed to protect the patient's identity).You can try my suggestions and update me if there is no improvement.Regards.

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