The study included 208 teeth with yellow-brown or creamy-white defects in children aged 6-12 years who were newly diagnosed with MIH with no substance loss or caries or prior restorative treatment. The children will be randomly divided into the experiment groups: control (oral hygiene motivation only), fluoride varnish, clinpro white Varnish and pastes containing CPP-ACP and followed up for 24 months. The evaluations will be made based on the ICDAS criteria and the measurements which were performed using the laser fluorescence method (DIAGNOdent, KaVo, Biberach, Germany) in the follow-ups.