Molar Incisor Hypomineralisation (MIH) is a developmental condition affecting the enamel of one or more of the first permanent molars, often accompanied by involvement of the permanent incisors. It results from a disturbance during enamel formation, leading to enamel that is softer, porous, and less mineralized than normal. Clinically, MIH is characterized by well-defined opacities on the enamel, ranging in color from white to yellow-brown, and may be associated with increased sensitivity or post-eruptive enamel breakdown. Although the exact cause is unknown, it is believed to be linked to systemic factors during early childhood, such as illness or environmental stress. MIH can pose challenges in both diagnosis and treatment due to the fragile nature of the enamel and its poor response to restorative materials.