The treatment time with invisible teeth aligners is different in each situation and depends upon several factors, primarily the severity of the teeth misalignment. In most cases, the aligners are worn between six months and two years, although it can also take longer in complex situations. The time the aligners must be worn also depends on the patient’s adherence and compliance to the procedure; if they are not consistent with wearing the aligners, the alignment progress can be reversed, meaning teeth can revert to their original position, negating any improvement.