well many things can cause it to have a loose feel. maybe it needs to be recemented (there are many conditions that say yes or not to this)> the tooth under could be fractured, get to the dentist soon. maybe the tooth itself is loose but you cant tell. unfortunatly you need to see a dentist in person to give you a proper diagnosis and treatmen plan.
in my practice, i would say 90% of the time that patients came in with a loose crown it was becasue something more involved related to the tooth underneath or the crown itelf (a perforation for example) was going on. I would say abot half the time it was becasue the tooth had had a root canal and the post became loose (hence the crown) due to a fracture or decay. vey rarely did i need only to recement a loose cown---ie very raely was everything ok underneath. a derntist needs to do an exam and evaluate why it came off.
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