1 doctor weighed in:

What would cause inside of my cheek to be sore and feel swollen after a root canal to upper tooth #14 done 3 days ago?

1 doctor weighed in
Dr. Reid Holtzclaw-swan
Internal Medicine

In brief: Hematoma or abscess?

It could be normal post-op healing and pain, a hematoma, or a developing abscess.
If it persists for several more days, or gets worse, I would go back to see your dentist.

In brief: Hematoma or abscess?

It could be normal post-op healing and pain, a hematoma, or a developing abscess.
If it persists for several more days, or gets worse, I would go back to see your dentist.
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