A member asked:

Getting a recurring mouth ulcer between gums and cheek near root canaled tooth, gums are tender and sore. dentist says x-ray of root canal looks good?

8 doctors weighed in across 4 answers
Dr. Daniel Rubenstein answered

Specializes in Dentistry

Any sore or lesion in the mouth that does not heal in 10-14 days, or is recurring, needs to be examined and possibly biopsied. If your dentist is unsure why you are have a lesion, Have the root canal evaluated by an endodontist. If the root canal is sound, and no other teeth are involved, see an oral surgeon or periodontist for an exam.

Answered Oct 8, 2020


Dr. Theodore Davantzis answered

Specializes in Dentistry

An ulcer should have nothing to do with your root canal therapy. An abscess or fistula would indicate an infection. If your dentist says the root canal tooth appears fine, then the ulceration must not be related.

Answered Oct 24, 2017


Dr. Debra Rosenblatt answered

Specializes in Dentistry

Two possibilities, the area is a fistulous tract and the tooth is either infected, has a missing canal not addressed or the tooth is fractured, the second possibility is that it is unrelated to the tooth in question and the origin needs to be evaluated by your dentist. If this is problematic, possibly seek a second opinion.

Answered Oct 7, 2016


Dr. John Scuba answered

Specializes in Oral and Maxillofacial Surgery

How a root canal “looks” on X-ray doesn’t matter. Symptoms like these may imply a “mouth” ulcer—from the procedure and instrumentation, or from an unrelated “Cold sore mouth ulcer” so many patients can experience. It can also be an incomplete or failed root canal, cracked tooth, and draining fistula from it, even with a “good” X-ray. A skilled examiner must ‘look harder”—at more than an X-ray.

Answered Sep 13, 2020



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