Prevalence of Molar-Incisor Hypomineralization Within an Orthodontic Department in the United States.

The purpose of this study was to determine the prevalence and severity of molar-incisor hypomineralization (MIH) by examining standard orthodontic intraoral photographs. A total of 690 patients were evaluated retrospectively for the presence or absence and extent of MIH using standardized assessment criteria. Fourteen percent of all patients examined presented with MIH on at least one tooth.