Perspective: The Finishing Problem with Aligners by Dr. Chad Foster

Categories: Orthodontics;
Perspective: The Finishing Problem with Aligners

by Dr. Chad Foster


Aligners have transformed orthodontics. Their efficiency, patient acceptance, and ability to deliver predictable tooth movement in many phases of treatment are undeniable. But for all their strengths, there remains one area where they consistently test even experienced clinicians: finishing.

The challenge is not in getting close—it is in getting exact.

Finishing with aligners often exposes the gap between digital prediction and biologic reality. Minor discrepancies in rotation, torque expression, marginal ridge alignment, or occlusal contacts that appear trivial on a screen can prove stubborn in the mouth. A fraction of a millimeter of tracking loss early in treatment may not seem consequential, but by the end, it compounds into visible and functional imperfections.

Unlike fixed appliances, where wire bending allows for real-time, highly precise adjustments, aligners rely on a series of pre-programmed movements. When those movements do not fully express, refinement becomes iterative rather than immediate. Additional scans, more trays, and extended treatment time can follow—often for corrections that would take minutes with traditional mechanics.

There is also a psychological component. Patients—and doctors—expect aligners to be clean, efficient, and nearly invisible in both process and outcome. When finishing drags on, that expectation is challenged.

Aligners are a wonderful tool that I enjoy using for many patients in my practice. The question is whether their finishing efficacy just “is what it is”… or if it will continue to evolve and improve with time.

Because in orthodontics, the last millimeter is so often the most demanding. 

Author Bio
Dr. Chad Foster Dr. Chad Foster is Orthotown’s editorial director, a board-certified orthodontist and owner of Butterfly Orthodontics in Phoenix. A graduate of Chapman University, he earned a Doctor of Dental Surgery and a master’s degree in craniofacial biology and completed his orthodontic residency at the University of Southern California. Foster writes and lectures internationally on the topic of orthodontic aesthetics.



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