My goodness, that is odd my friend.
I would get a second opinion from an unrelated dentist who has not talked with this one.
Roots can be left behind somethimes, but you didn't have an extraction did you. hmmm. I have had so much pain in my teeth, boy I would not do anything unless it was a problem somehow.
If your teeth are working for you, leave them alone for gawds sakes, just keep them clean. Am I out of line with this sentiment> i hope I am not causing you distress.
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John Maynard Keynes: "If governments should refrain from regulation ... the worthlessness of the money becomes apparent and the fraud upon the public can be concealed no longer."
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Root reabsorption 
