It is the most technologically advanced treatment method in modern orthodontics. It is an orthodontic treatment system that uses thin, transparent aligners that tightly cover the teeth, instead of brackets and wires, and are virtually invisible from the outside. It is a system in which digital intraoral impressions are taken and a completely customized series of transparent aligners, called aligners, are prepared and applied using digital treatment planning. The patient must wear the prepared aligners for at least 20 hours a day, switching to the next aligner every 10-15 days. While there is no need for the doctor to examine the patient each time a new aligner is switched, the orthodontist will determine the appropriate appointment interval. Since it is virtually invisible from the outside, it is ideal for those who wish to undergo orthodontic treatment but have aesthetic concerns. Additionally, it is preferred over treatments using brackets due to the absence of dietary restrictions and the comfort of use. It also has the advantage of being able to show the treatment outcome from the very beginning of the treatment.