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Re:The 'Irrational' Way Humans Interact With Dentists by ars on Tuesday October 12, 2010 @05:10PM (#1784989)
That seems to be "Laser Fluorescence Cavity Detection", brand name "DIAGNOdent" (for all the people asking where to find him, I guess you can ask for this by name).

But it's not a perfect system - detection is about 80% to 90%, http://jdr.sagepub.com/content/83/suppl_1/C80/T1.expansion.h...

Re:The 'Irrational' Way Humans Interact With Dentists by cdr on Tuesday October 12, 2010 @06:24PM (#1785222)
80% to 90% sounds massively better than x-ray.