What is Molar-Incisor Hypomineralisation (MIH)? MIH is a condition where the enamel of the teeth is softer than normal, leading to decay or a crumbly tooth. It typically affects adult incisors and molars as they emerge around 6-7 years of age, though it can sometimes be seen in baby molars. Who is Affected? Approximately 1 in 8 children in the UK have MIH, with the cause being unclear. Possible factors include disturbances during tooth development, severe childhood illnesses, or high fevers. Sig