As we approach the millennium, much is spoken about the decline in dental caries among the younger population and the long-term effects that this decline may have on the profession. Yet there is a tendency to ignore our aging population with its often extensively restored dentitions. The management of restoration failure will become an everincreasing challenge to the profession. In many instances, recurrent caries will result in the loss of single or multiple dental units. The detection of recurrent caries adjacent to radiopaque restorations remains a challenge to our profession.