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. 2019 Apr 5;14(4):e0214948. doi: 10.1371/journal.pone.0214948

Fig 2. Electron micrographs of the enamel surface submitted to different bleaching times with 10% carbamide peroxide (PC 10%).

Fig 2

A1 and A2: unclarified enamel (negative control; G1), the absence of changes in enamel surface, the presence of aprismatic layer. B1 and B2: bleaching with PC 10% for 14 days (G2), indicated partial removal of the prismatic layer and gradual exposure of the prismatic enamel. C1 and C2: PC 10% for 21 days (G3), showed a continuity of removal of the aprismatic layer and greater exposure of areas of prismatic enamel. D1 and D2: PC 10% for 28 days (G4), show a presence of an irregular surface with more significant loss of the central portion of the prisms (D.1) and discontinuity of the interprismatic enamel (arrows) (D.2).