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Abstract
To evaluate the colour masking ability of caries infiltration system, this invivo study was carried out on a total of thirty anterior teeth with inactive post-orthodontic white spot lesions on the facial surface, selected from seven children aging from 9-16 years old of the outpatients{u2019} clinic of Orthodontic Department, Faculty of Oral and Dental Medicine, Cairo University. Teeth were free from any enamel defect. They were divided randomly into two groups and each group contained fifteen teeth receiving different treatments