Caries Prevention Potential of Pearl Powder Versus CPP-ACP on Enamel White Spot Lesions

Inclusion Criteria: * good oral hygiene * cooperative patient * completion of orthodontic therapy * presence of at least two white spot lesions on the labial surface of six maxillary anterior teeth, that were not present before orthodontic treatment Exclusion Criteria: * bad oral hygiene * lack of patients compliance * allergy to milk products * pregnant or lactating women * presence of dentin caries, restorations, or enamel hypoplasia on maxillary anterior teeth * presence of periodontal pockets around maxillary anterior teeth