well Root canal treated teeth do last long! Getting a crown doesn't mean its not treated , crown is the part of the restoration it acts as a cover over tooth as after root canal treatment treatment it gets brittle and is liable to fracture if not covered with a crown in cases where more of the tooth structure is destroyed!
having a crown doesn't lessens the life of the tooth but it prolongs it!
root canal treated teeth definitely lasts for longer but if hygiene maintained!!!!

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