Inclusion Criteria:  The inclusion criteria of participated children :  Age rang 7-10 years. Teeth with score 0, 1 or 2 according to (international caries detection and assessment system) ICDAS II index. Patient did not receive any re-mineralizing agent other than the regular toothpaste during the past three months. No known history of allergy against silver particles or colophonium.  written informed consent from the parents/guardians.  Exclusion Criteria:  Teeth with score 3 or more according to ICDAS II index. Partially erupted permanent teeth.