These are transparent, plastic form of dental braces used to correct malaligned teeth. They use constant and gentle force over the malaligned teeth to bring them back to their normal or desired position.
These are made up of special plastic which is transparent but tough enough. They are customized for each patient and are more comfortable than metal braces. They snuggly fit and over a period of time become a part of your body. Also, they do not cause speech problems.
One can remove them while having food/brushing teeth. You need to wear them for at least 20 hours a day for effective results.
Overall treatment/recovery time is approximately 13-15 months, but it depends on the patient's degree of malalignment and overall compliance.