Objective: To investigate the prevalence and severity of molar incisor hypomineralization (MIH).
Materials and methods: A sample of 2,864 students aged 8-12 years were selected from government and private schools in Chennai. MIH was diagnosed clinically based on the diagnostic criteria established by the European Academy of Pediatric Dentistry (EAPD) 2003.
Results: A total of 277 children (9.7%) had MIH. There was statistically significant difference in prevalence related to age but there was no statistical difference in prevalence with respect to gender.
Conclusion: Prevalence of MIH was 9.7% in the child population residing in Chennai. Males and females were equally affected. The rate of occurrence and severity of MIH are more in the right mandibular first molar. The severity of MIH is more in molars compared to incisors (P < 0.001) and is more in government schools compared to private schools (P = 0.002).