One of the greatest complements a dentist can get is when he hands the patient the mirror and hears, "Doc, which one?  I can't see it!  Take this case for example.

Note the small old style silver filling with decay right behind it in the groove.  After placing proper retraction this is what is able to be achieved:

Total time less than a half hour.  Unlike old style silver fillings, this new tooth colored filling can be used without waiting and should last a long, long time.