By Teeth Video 
Invisalign aligners are clear, plastic aligners that go around the teeth and gradually change their position. Computer-generated images and 3D scans are taken, and impressions are created to form the aligners to force the teeth to the new position.
Invisalign aligners are just one type of different clear aligners.
Due to the close contact of the aligners, the force on the tooth is precise and this gives the planned tooth movement. The orthodontist plans for a series of movements to eventually get the teeth into position. The movements are simulated according to where the teeth should move, and then different sets of aligners (trays) are formed using 3D printing.
The aligners can be removed to clean the teeth, but they must be worn for at least 22 hours a day to get the planned movement.
Losing tracking occurs when the planned tooth movement has not happened, and so the next tray does not align properly with the teeth.
Rotating teeth is difficult to achieve with aligners.
Extruding teeth is another challenge with aligners. Attachments are then used to guide the teeth to achieve the correct position.
Always get a good orthodontist to advise you about the treatment options available.
