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Time sequence of a 6 h eroded specimen with application of optical gel taken at (a) 0 s, (b) 5 s, (c) 15 s, (d) 30 s, (e) 1 min, and (f) 2 min using 405-nm illumination. A reversal of intensity between the eroded region and sound enamel occurs over this time span as the optical gel penetrates into the porous subsurface enamel within the erosion.
