Comparison of a 3-step Bonding System (Transbond™ XT) and a 2-step System (GC Ortho Connect™) on Demineralization Around Maxillary Orthodontic Brackets

Inclusion Criteria: * Patient aged 10 to 16 years included, * Patient attending their first dentofacial orthopedics consultation at the Montpellier Dental Care Center, in adolescent or young adult dentition (according to Démogé classification), * Patient requiring the placement of a bimaxillary multi-bracket treatment and opting for a metallic vestibular technique. Exclusion Criteria: * Syndromic patient (all syndromes included, e.g., cleft lip) or with a severe long-term condition (ALD), * Patient previously treated with a multi-bracket orthodontic treatment using a mixed, lingual, or vestibular technique, * Any medical condition deemed incompatible with bracket placement by the investigator, * Patient with severe MIH (molar-incisor hypomineralization) and/or severe demineralization on one or more teeth (including severe amelogenesis imperfecta or dentinogenesis imperfecta), * Patient with restorations such as metal crowns, ceramic crowns, porcelain-fused-to-metal crowns, inlays, onlays, or amalgam on one or more vestibular surfaces, * Patient with oral hygiene incompatible with orthodontic treatment, * Agenesis of lateral incisors, * Subject already participating in another interventional clinical trial that could interfere with this study, * Uncontrolled psychiatric disorder, * Lack of written informed consent from a legal representative after a reflection period, * Lack of cooperation or difficulty in communication/comprehension, or refusal of participation by the mino…