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My brother has had crowns on one of his front teeth all his life (since he was about 8 and his adult tooth came through black after he smashed his face into the side of the bath when he was about 4). He's had to replace the crown a number of times just because over time sometimes they 'fall off'.
From my understanding, sometimes crowns stay on for life, but it's fairly common for them to deteriorate over time.
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