Abstract The purpose of the present study was to compare the perceptions of the parents/ caregivers of young people with and without Mucopolysaccharidosis (MPS) with regards to their oral health-related quality of life (OHRQoL). A cross-sectional study was conducted with 29 individuals with MPS and 29 normotypic individuals aged three to 21 years and their parents/caregivers. All parents/caregivers of young people with MPS in follow-up at two reference hospitals in the city of Belo Horizonte, southeastern Brazil, were invited to participate in the study. Individuals without MPS were recruited from the pediatric clinics of both hospitals. Parents/caregivers answered a structured questionnaire addressing the sociodemographic characteristics, behavioral habits and medical and dental history of the children as well as the Brazilian short-form version of the Parental-Caregiver (P-CPQ). The individuals with and without MPS were examined for malocclusion, dental caries and oral hygiene by an examiner who had undergone training and calibration exercises. Mean age of the subjects was 12.1 years (± 4.2). Comparing total P-CPQ scores and scores on the oral symptoms, functional limitations and wellbeing domains, the parents/caregivers individuos with MPS reported a statistically significant greater negative impact on OS domain than their counterparts. Regarding the clinical variables, malocclusion was also associated a greater negative impact on OHRQoL of young people with MPS when compared to those of young people without MPS. Our findings show the great negative impact caused by the malocclusion of young people with MPS.