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From a technical standpoint, the steel used on car bodies is galvanized, which is a zinc plating. Zinc flakes off when the metal is bent and you lose the corrosion resistance it provides. Most of the time, the paint that's applied to a straightened body panel is water tight and the panel is protected, but it's not as well protected and if the paint wasn't applied right or it's not a great paint, then there will be corrosion problems in that area.
So fixing a dented panel is never as good as a new part from that standpoint.
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