How long should my crowns last? (Photos)

I have two crowns on tooth number 2 and 3. They were placed 3 years ago with problems from the start. Once the second crown was placed there was a huge gap that allowed food to become impacted between the two crowns. There was also constant bleeding 1st the gym line due to constant irritations Another crown placed on tooth 12 at which time I was told that the gap and margins of the crown were poorly done. 4 total crowns with two failing that were placed by the same dentist.

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