Your software plans 3 mm of intrusion. The patient achieves 1.7 mm. A 2026 systematic review found that clear aligners typically deliver only 50-60% of planned lower incisor intrusion in deep-bite cases. The movement is real. The predictability gap is real too. This article explores what that means for case selection, treatment planning and why many deep-bite refinements can be predicted before the first aligner is delivered.

Your aligner setup looked clean. The animation was smooth. Three refinements later, you're still not where you planned to be. The problem didn't start when tracking failed. It started the moment you approved the plan.

Digital treatment planning has made clear aligner therapy feel more precise than ever. Virtual setups show clean, isolated tooth movements and create the impression that orthodontic planning is largely a matter of approving the right simulation. Clinically, that impression is misleading. What looks simple on a screen is rarely simple in the mouth. Many aligner treatments fail to finish predictably not because the software is poor or the patient is non-compliant, but because f