Does molar-incisor hypomineralization (MIH) affect only permanent first molars and incisors? New observations on permanent second molars.

Enamel hypomineralization mainly affects the first and second permanent molars. Mild defects in the second permanent molars tend to be more frequent in patients with severe MIH in the first permanent molars. The presence of enamel hypomineralization was associated with higher dental caries experience.