Invisalign or Invisalign Teen uses a series of clear, fully-custom appliances called aligners. They are removable and virtually undetectable. Each aligner is worn for about two weeks, and are updated through a series of successive trays. Through the process, it is important to visit your Orthodontist for scheduled check-ups, to ensure the treatment is administered correctly. Your orthodontist will carefully observe improvements and will determine if any changes or modifications are needed before fully completing the course of treatment.