The length of Invisalign treatment varies depending on the complexity of the alignment issue. Some minor cases may take around six months, while more moderate cases may require twelve to eighteen months. At the Melbourne Smile Clinic, our dentist will provide an estimated timeline once your teeth have been assessed and a treatment plan has been created. Aligners are usually changed every one to two weeks to continue guiding the teeth into position. Consistently wearing the aligners for the recommended number of hours each day is essential to keep treatment progressing as planned.