Summary
There are many reasons for this to occur. However, in my experience, I have found that teeth that develop infections like yours and especially on the front tooth have a history of trauma. This trauma usually occurs in childhood and many years later the tooth turns dark and an x-ray reveals an infection.
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Extract
Ask Dr. Rochlen
Dear Dr. Rochlen:
I had a crown placed on my tooth a wee...See the full content of this document
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