Finishing a Phase 1 case—whether using Invisalign First, braces, or functional appliances—is about more than just straight front teeth. As I emphasize in my clinical deep dives, the goal of interceptive treatment is to correct structural and functional issues before the permanent dentition fully erupts. If you don’t achieve proper torque on the 2-2s, eliminate all crossbites, and ensure at least 0.4–0.6mm of space for the permanent 3’s, you’re essentially leaving a “Phase 1.5” mess for your future self.

Beyond the teeth, you must verify that the patient has unobstructed nasal breathing and that the tongue is resting on “The Spot” without active oral habits. Stopping treatment before reaching these milestones often leads to longer, more invasive Phase 2 treatments or even preventable impactions. By sticking to this 9-point checklist, you ensure a functionally stable result and a much happier parent who sees the long-term value in your interceptive care.