Inclusion Criteria:  Apparently healthy cooperative children Aging from 3-8 years old child Both genders Primary teeth with active WSLs on buccal or labial surfaces Patient and parent acceptance to treatment and maintenance of good oral hygiene  Exclusion Criteria:  Restored teeth White spot lesions due to fluorosis Teeth with hypoplasia Lesions that require an invasive treatment Any pathology or concomitant medication affecting salivary flow or causing dry mouth