By the end of this session, participants should be able to: 1. Define the principles of clear aligner therapy (CAT) and the role of Invisalign in modern orthodontics. 2. Identify suitable case selection criteria for clear aligner treatment based on malocclusion type and complexity. 3. Describe the diagnostic workflow, including clinical examination, records acquisition, and digital scans. 4. Explain the treatment planning process using ClinCheck® software — including staging, attachments, and movement sequencing. 5. Interpret the biomechanics of tooth movement specific to aligner therapy. 6. Select appropriate auxiliary techniques (e.g., elastics, attachments, IPR) to enhance treatment outcomes. 7. Evaluate and modify treatment plans to achieve optimal functional and aesthetic results. 8. Recognize the limitations and challenges of clear aligner treatment and how to manage them. 9. Monitor and assess treatment progress and patient compliance effectively. 10. Discuss the post-treatment retention protocols and long-term stability in clear aligner cases.