Orthodontic treatment is the movement of teeth. The most common reason for moving teeth is to improve teeth alignment and hence improve smiles. The two main methods of moving teeth are by braces or by using clear aligners.
Braces are usually worn by teenagers and is considered a FIXED form of orthodonitic treatment. Brackets, wires and elastics are used to move teeth. They are placed on and removed by a dentist.
Clear aligners tend to be the more preferred method of orthodontic treatment for adults. They are a more aesthetic option of orthodontic treatment. Treatment with clear aligners is not very obvious, difficult to see and hence the term clear or invisible