Annie, I would recommend you speak to your dentist about your concerns. If the bite problem occurred due to a new crown then your dentist should be able to diagnose the problem and sort it for you.
With regards to the sensitivity, it very much depends on diagnosis.
Root treatments can be done through new crowns with extremely minimal damage after it has been placed and is done when needed. Your dentist will guide you as to whether it needs replacing
I hope this helps
Kindest regards
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