Fig. (1) Representative QLF images from the experimental groups. (A) untreated, (B) 1100 ppm NaF, (C) 0 wt% S-PRG, (D) 1 wt% S-PRG, (E) 5 wt% S-PRG, (F) 20 wt% S-PRG, (G) 30 wt% S-PRG.

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