Tooth Discoloration and Chairside Handling Time (Bonding-Debonding) in Flowable Versus Packable Composites for Clear Aligner Bonded Attachments: A Randomized Clinical Trial

Inclusion Criteria: * Adults 18-40 years. * patients with class l malocclusion with in which there treatment will be completed in 6 month . * Completed clear aligner therapy and scheduled for attachment debonding at the study clinic. * Permanent teeth with intact buccal enamel at assessment sites. * No caries, restorations, cracks, fluorosis, or hypoplasia on assessed surfaces. * No bleaching within 6 months prior to baseline. * Good general health (ASA I-II) and able to provide written informed consent. * Satisfactory oral hygiene and gingival health (e.g., GI ≤ 1). * Willing and able to complete measurements: spectrophotometric shade (CIE L\*, a\*, b\*), photographs/scans, and VAS for pain/discomfort. * Available for all visits and follow-up assessment. Exclusion Criteria: * Patients younger than 18 or older than 40 years. * Patients presenting with severe or very severe anterior crowding (LII \> 6 mm) or spacing will exclude from the study. Cases with posterior crossbites, open bites, or skeletal discrepancies * Presence of systemic diseases (ASA \> II) that may affect healing, pain perception, or enamel quality. * Teeth with caries, restorations, fractures, enamel cracks, fluorosis, hypoplasia, or discolorations on the buccal surfaces at assessment sites. * Patients who have undergone tooth bleaching within the last 6 months. * History of major dental surgery or trauma in the study region. * Patients with poor oral hygiene or gingival inflammation (GI \> 1). * Pregnant or lactating women. * Patients with allergy or hypersensitivity to composite resins or dental adhesives. * Individuals unable to provide informed consent or not willing to comply with study visits.