Introduction Clear aligners are a modern orthodontic option designed to move teeth gradually using a series of transparent, removable trays. They are widely valued for their discreet appearance and convenience, making them an appealing alternative to conventional fixed braces for many patients. Materials and Design Most clear aligners are made from medical-grade thermoplastic polymers, commonly polyurethane-based materials or other specialized polymer blends. These materials are selected for their transparency, flexibility, strength, and ability to apply controlled forces to teeth. Each aligner is custom-made from a digital treatment plan, often using intraoral scans and computer-aided design and manufacturing (CAD/CAM). A sequence of aligners is produced, with each tray designed to make a small, planned tooth movement. How They Work When an aligner is placed over the teeth, it exerts gentle pressure that encourages movement through the supporting periodontal tissues. Patients typically progress through the aligner series according to their orthodontist’s instructions. Small tooth-colored attachments may be bonded to selected teeth to improve grip and help achieve more complex movements. Successful treatment depends on accurate planning, good fit, and consistent wear—often around 20–22 hours per day, as directed by the treating clinician. Advantages and Limitations Clear aligners are removable, easy to clean, and generally less noticeable than metal braces. They can also make eating and oral hygiene easier because the trays are removed during meals and brushing. However, they require patient cooperation and may not be suitable for every malocclusion. Some complex tooth movements can be less predictable, and treatment may require refinements or additional aligners. Regular professional monitoring remains essential. Conclusion Clear aligner therapy combines orthodontic principles with advanced polymer materials and digital technology. When carefully planned and used under professional supervision, it can provide an effective and aesthetic way to correct selected dental irregularities while supporting patient comfort and oral hygiene.