is X-ray showing old abscess?

I had an abscess after my bridge was fitted 9 yrs ago. I had antibiotics and the pain stopped. Now my new dentist is saying I need a root canal as the X-ray shows an abscess in the same tooth. I have no pain or symptoms and am referred for a root canal through the bridge. Could the X-ray be showing the old abscess. I am unsure how this can be an abscess after 9 years in same tooth with no symptoms. Do I need a root canal?

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