Modified Atraumatic Restorative Treatment Using CPP ACP

* Inclusion Criteria: Clinical Criteria: Children aged 4-7 years. Apparently healthy children. Children with mild to moderate occlusal carious lesions in the mandibular second primary molar indicated for indirect pulp capping. No history of spontaneous pain, pathologic mobility, draining sinus tract, redness or swelling of vestibule. Normal gingival and periodontal condition, with no sensitivity to vestibular palpation, and no pain on percussion test. Radiographic criteria: * No sign of radiolucency in periapical or furcation area. * No widening of PDL space or loss of lamina dura continuity. * No evidence of internal/external pathologic root resorption. Exclusion Criteria: * Uncooperative children to avoid time waste and attrition bias. * Children with systemic disease as some systemic diseases may have effect on the outcome Children with known allergy to any of the components being utilized. Molars near exfoliation. Primary molars with more than half of the root resorbed or with periapical pathology as evident radiographically Mobile or ankylosed molars with no permanent successors * Unable to attend follow-up visits to avoid attrition bias by decreasing number of drop off cases. * Refusal of participation as the parent of child has the authority of participation.