Loose dental crown is a common problem which is encountered by the patients after getting dental crown.If you have no sensitivity, just leave it out until you visit your dentist.If it is sensitive, you can put a little drop of toothpaste in the temporary crown and see if it makes enough suction to hold it in place. If not, the drug store sells a few brands of temporary dental cement. Just buy a pack and follow the directions. Be sure to flick as much of the old cement out as you can before you start.Also,minimize using the side of your mouth that has the temporary crown.Keep sticky foods off your temporary and avoid chewing hard foods.
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