Table 1: ICDAS II criteria.

ICDAS

Description

ICDAS 0

Sound tooth surface: no evidence of caries after prolonged air drying.

ICDAS 1

First visual change in enamel: Opacity or discoloration (white or brown) is visible after prolonged air drying.

ICDAS 2

Distinct visual change in enamel: Opacity or discoloration visible on a wet tooth surface.

ICDAS 3

Localized enamel break-down due to caries with no visible dentine or underlying shadow.

ICDAS 4

Underlying dark shadow from dentine with or without localized enamel breakdown.

ICDAS 5

Distinct cavity with visible dentine.

ICDAS 6

Extensive distinct cavity with visible dentine and more than half of the surface involved.