Caries visible when wet?
Cavity with exposed dentin?
More than half tooth involved?
Undermining shadow?
Is there micro-cavitation?
Lesion confined to base of fissure?
Any opacity or discoloration?
Code 3
Code 4
Code 0
ICDAS Decision Tree
© JK Mitchell, DDS, MEd. Information from ICDAS website.
Yes
No
Yes
Code 6
Code 5
Yes
No
No
No
Dry and re-examine
Yes
No
Code 1
Code 2
Yes
No
Code 1Yes
No
YesDry and re-
examine
© JK Mitchell, DDS, MEd. From ICDAS website