Inclusion criteria  Patients aged from 8 to 12 years old Patients who are medically free from any diseases that would cause enamel defects. Patients should have WSLs in labial surface of upper or lower permanent anterior teeth with a score of 1 & 2 according to the ICDAS that don't require operative intervention.  Exclusion criteria  Patients receiving the following medications will be excluded from the study: tetracyclines, any other medication known to stain teeth, any medication causing dry mouth and/or xerostomia. Uncooperative patients Mouth breathers