Clear aligners, also known as clear-aligner treatment, are orthodontic devices that uses incremental transparent aligners to adjust teeth as an alternative to dental braces. They are sold under at least five brand names.
A 2014 systematic review concluded that there is insufficient evidence to determine the effectiveness of these therapies. Clear-aligner treatment involves an orthodontist or dentist, or with home-based systems, the person themselves, taking a mold of the patient’s teeth, which is used to create a digital tooth scan. The computerized model suggests stages between the current and desired teeth positions, and aligners are created for each stage. Each aligner is worn for 20 hours a day for two weeks.[4] These slowly move the teeth into the position agreed between the orthodontist/dentist and the patient. The average treatment time is 13.5 months.[5] https://en.wikipedia.org/wiki/Clear_aligners