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Table 1 Visual examination criteria “ICDAS”

From: Distribution of white spot lesions among orthodontic patients attending teaching institutes in Khartoum

0 Sound tooth surface: no evidence of caries after prolonged air drying (5 s)
1 First visual change in enamel: opacity or discoloration (white or brown) is visible after prolonged air drying
2 Distinct visual change in enamel: opacity or discoloration distinctly when wet, lesion must still be visible when dry