OBJECTIVE: To establish the relationship between molar incisor hypomineralization (MIH) and gender, and severity with risk factors in children from 6 to 11 years of age at CEIPSM "Sagrada Familia" METHOD: A quantitative research was developed. Non-experimental, crosssectional and correlational design. Made up of 455 student children from 6 to 11 years of age from CEIPSM “SAGRADA FAMILIA”. For the diagnosis, the criteria established by the European Academy of Pediatric Dentistry (EAPD) were used, for the degree of severity the Mathu-Muju and Wright criteria were used. Schoolchildren who presented this condition were given a survey to parents with risk factors linked to the appearance of MIH. RESULTS: In relation to the prevalence, the sample presented 15% of cases MIH in relation to gender, the female showed 53% of cases of MIH compared to the male sex with 47%. Regarding age, a highe...