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Clear aligners involves a series of thermoformed appliances made from a transparent, thin (less than 1 mm) plastic material formed with CAD-CAM laboratory techniques. These aligners are similar to the splints that cover the clinical crowns and the marginal gingiva. Each aligner is designed to move the teeth a maximum of about 0.25 to 0.3 mm over a 2week period, and is worn in a specific sequence. There are various clear aligners currently recommended for adults and for adolescents with fully erupted permanent teeth who meet an acceptable standard of compliance. Excellent compliance is...