Prevalence of Enamel Hypomineralisation/Molar Incisor Hypomineralisation: A Scoping Review

The aim of this scoping review was to provide an up-to-date assessment of the prevalence of enamel hypomineralisation (EH) and, in particular, molar incisor hypomineralisation (MIH). Epidemiological studies published from 2010 to 2023 were analyzed. After screening the primary literature, a total of 139 studies were included. According to the available epidemiological trials of children and adolescents from Europe (n = 39), the average prevalence of EH/MIH was 16.74%. The data from Asian studies (n = 50) showed an average prevalence of 15.6%. For South America (n = 33 studies), the mean prevalence of EH/MIH was 16.7%. The mean prevalence rates for North America (N = 9 studies), Africa (N = 6), and Australia (N = 2) were 25.9%, 11.4%, and 16.8%, respectively. Taken together, these data indicate that EH/MIH is a prevalent condition worldwide. With the aim of standardizing and generating comparable prevalence data, the use of the currently established criteria by the European Academy of Paediatric Dentistry (EAPD) for the detection of EH/MIH may support consistent reporting in epidemiological trials. However, other EH/MIH indices and phenotypes do exist. As the determination of EH/MIH prevalence depends on the correct use of index teeth, meticulous attention must be given to their correct application.