What You Should Do If Temporary Crown Fell Off 1. Remove the Crown The first thing you will want to do is to remove the crown from your mouth, lest you end up swallowing it, or worse inhaling it into your lungs. 2. Call Your Dentist Make a call to your dentist letting him know that your temporary crown fell off, and you will want to be able to give them as many details as possible. The dentist may advise you to try a self-repair using a temporary dental glue before your next