Many patients are surprised to know that they can get a new cavity underneath a previous placed filling. This can occur for a number of reasons. It is very important to have your fillings checked regularly so that these cavities can be repaired before the tooth needs more extensive treatment.
The decay has been removed. The picture shows healthy dentin free of bacteria.
A new filling has been placed which is nicely sealed and integrated to the surrounding enamel. Notice the natural contours and tooth anatomy which allow cleaning with floss and proper function with the opposing tooth.