Clinical Performance of Giomer Preceded by Etching Versus Resin-Based Sealants Applied on Permanent Molars Affected by Molar-Incisor Hypo-mineralization

Inclusion Criteria: * Healthy children aged 6-14 years who are diagnosed with mild (MIH) according to European Academy of Pediatric Dentistry (EAPD) criteria which includes demarcated enamel opacities (white, creamy, or yellow to brownish), that may induce sensitivity to external stimuli without enamel breakdown. * Cooperative children. * Presenting at least one first permanent molar (FPMs) that were fully erupted and indicated for non-invasive fissure sealant. * Medically fit Children (ASA I). Exclusion Criteria: * Children have hypomineralized (FPMs) with post-eruptive breakdown, cavitated and non-cavitated carious lesions, restorations, or fixed orthodontic appliances. * Enamel defects due to a condition other than (MIH). * Parents are not willing to join. * Molars that cannot be isolated using rubber dam. * Uncooperative children. * Medically unfit children (other than ASA I).