Please check with your dentist for his or her recommendation.
First off, don't recommend using glue or other house-hold adhesives to re-cement your tooth/ crown
. There are products which can be used to re-cement crowns that have fallen off. Recapit, temparin, and dentemp are three such products. Follow the directions that come with the product. Make sure your tooth is clean and dry. If it is wet, it can impact the seal. You can clean the interior of the crown and make sure that it is also clean and dry. Check to make sure the crown fits evenly, before you cement it in. If not there might be a piece of cement on your tooth or in the crown that is the cause. This could be gently scraped off.