Prevalence of Hypomineralized Second Primary Molars and Their Association with Dental Hypersensitivity in Egyptian Children

Inclusion Criteria: * Egyptian children * cooperative patients both genders and included 4-9 years old children at least one HSPM affected molar and one non affected molar absence of syndromes or craniofacial anomalies Exclusion Criteria: * other developmental defects(amelogensis imperfecta ...) children ongoing anti-inflammatory drugs children who caregiver will not sign the informed consent