Molar–incisor hypomineralization: parent’s and children’s impact perceptions on the oral health-related quality of life

To evaluate the perception of parents and children and the impact of molar and incisor hypomineralization (MIH) on the oral health-related quality of life (OHRQoL). A cross-sectional study was conducted with a group of 253 children aged 6–12 years presenting MIH and their parents or guardians who initially answered an interview containing socioeconomic and demographic questions as well as the Parental–Caregiver’s Perceptions Questionnaire (P-CPQ). The children answered the Child Perceptions Questionnaire (CPQ8-10) and Child Perceptions Questionnaire (CPQ11–14) and the clinical evaluation of MIH was performed. Poisson regression with robust variance was used in the data analysis. The parent’s perception showed that the impact felt by the children regarding caries leads to a higher oral symptom impact, functional limitation, emotional well-being and total PCPQ score domains, as well. For children with severe MIH, a higher prevalence of impact was felt regarding the functional limitation and emotional well-being. For CPQ8–10, the oral symptoms domain presented the highest mean score, while CPQ11–14 showed the functional limitations domain and P-CPQ the emotional well-being domain. Considering the perception of parents or guardians, it was concluded that MIH promotes a negative impact on the OHRQoL. MIH had no significant impact on OHRQoL according to children’s perceptions.