My crown fell off. Does the dentist have to numb you to recement it back on?

Hello, The most likely reason for this is an uneven relation on the way the upper and lower crowns are biting (bad occlusion)... the back teeth have cusps that need to be correctly related to their counterparts [top or bottom], if not, it can cause tissue [lips, cheek] biting. Hope this helps...

Hello, Yes, x rays will be very important to identify the problem if there is any at all. It will also determine if root canal treatment will need to be performed on the tooth. If there are in fact cavities under the filling, if not treated in time, will probably get severe. You already have the...

The essentially is what is often called a "full mouth reconstruction" and is often a great choice.  The photos provided appear to show a case that bleaching and bonding would not be enough, so a FM rehab should be considered.