Color Change and Desensitization of Molar Incisor Hypomineralization-Affected Enamel Using Biomimetic Nano-Hydroxyapatite Toothpaste

This clinical trial aims to evaluate if nano-hydroxyapatite (Nano-HA) toothpaste effectively treats children with Molar-Incisor Hypomineralization (MIH). It will also assess the safety of Nano-HA toothpaste. The main questions are: * Does Nano-HA toothpaste reduce caries incidence, improve tooth aesthetics, and decrease hypersensitivity? * How does Nano-HA compare to fluoridated toothpaste in terms of outcomes? Participants will: * Use Nano-HA or fluoridated toothpaste daily for 12 months. * Visit the clinic for checkups and evaluations every 1 to 3 months. * Record symptoms, brushing compliance, and sensitivity. The study will compare Nano-HA toothpaste to fluoridated toothpaste to determine its efficacy in managing MIH .