The mock-up application is of great importance in the treatment plan of the smile design candidate. With this application, an opinion about the result of the treatment is formed at the beginning of the treatment. If it will be necessary to open the mock-up application; It offers the opportunity to see the result of the operations to be performed on the teeth of the person, that is, the "final smile", as a preliminary design, without touching the teeth. The main purpose of giving importance to the mock-up process; while the procedures to be applied have not yet started; due to the importance given to showing the final smile to the person. Thus, your smile is shaped within the framework of your expectations.