**Question:** What is ICDAS score given to the tooth below?

**Correct Answer:** C.

**Core Concept:** The International Caries Detection and Assessment System (ICDAS) is a standardized method used to assess dental caries by dentists and dental professionals. It provides a numerical coding system ranging from 0 to 6, where 0 indicates a sound tooth surface and 6 indicates a completely filled or extracted tooth.

**Why the Correct Answer is Right:** In this case, the tooth shows a moderate lesion that has penetrated the enamel but not the dentin, resulting in a score of 4. This score indicates a carious lesion that requires intervention to prevent progression to deeper layers of the tooth or cavitation.

**Why Each Wrong Option is Incorrect:**

A. ICDAS score 0 indicates a sound tooth surface, which is not the case here as the tooth has a carious lesion.
B. Score 1 represents a very early enamel lesion, which is less severe than the observed condition.
D. Score 6 represents a completely filled or extracted tooth, which is not applicable for this tooth with a moderate carious lesion.

**Clinical Pearl:** Understanding the ICDAS scoring system aids in appropriate diagnosis, treatment planning, and communication between healthcare professionals regarding dental caries assessment.

**Why Option C is Right:** Option C represents a moderate carious lesion that has penetrated the enamel but not the dentin, resulting in a score of 4. This score highlights the need for intervention to prevent the lesion from progressing to deeper tooth layers or cavitation.

**Why Option D is Incorrect:** Score 6 indicates a completely filled or extracted tooth, which is not applicable for a tooth with a moderate carious lesion.