Table 3.

Visual examination criteria used in the selection and assessment of samples [10].

Score	Visual assessment criterion
1	No, or slight, change in enamel translucency after air-drying for 5 seconds
2	Opacity or discoloration hardly visible on the wet surface but visible after air-drying
3	Visible opacity or discoloration without air-drying
4	Localised enamel breakdown with opacity or greyish discoloration from the underlying dentin
5	Cavitation in opaque or discolored enamel exposing the dentin