Figure 3. Atomic force micrographs of the enamel surface of specimens in different treatment groups. (a) negative control; (b) 0.08 mg/mL rGO/Ag; (c) 0.12 mg/mL rGO/Ag; (d) 0.16 mg/mL rGO/Ag; (e) 0.16 mg/mL rGO; (f) 0.16 mg/mL AgNPs; (g) 10 ppm NaF; (h) native enamel.