Attachments in clear aligner treatment are crucial for enhancing biomechanics and achieving precise tooth movements. They improve aligner retention by creating a protrusion on tooth surfaces, enhancing force application and contact area. The shape, size, and placement of attachments significantly influence treatment efficacy, with different designs tailored for specific movements. Attachments aid in complex treatments like extrusion, rotation, and root control, improving treatment outcomes. Composite attachments offer esthetic benefits but may have drawbacks like shrinkage. Understanding attachment biomechanics is essential for selecting the right attachments to optimize orthodontic treatment efficacy and efficiency.