After braces removed we can see small variations in the edges that will interfere with opposing teeth as the bite is shifted forward; placing edges at risk of fracture and irregular wear.
What is normally and regularly done with Orthodontics is that the teeth are aligned and roots made parallel; this is normally confirmed with a progress radiograph. Once aligned, the edges are re-adjusted or polished to match the new axial position of the teeth. Small differences in gingival height can be adjusted by moving the teeth with the braces but the edges may require adjustment following the leveling of the gingiva. This can be a problem in kids where primary teeth remain too long and affect the eruption of one or more teeth on one side; it can also happed as poor occlusion causes asymmetric wear and a tooth keeps erupting as it is worn down (bringing the gum level with it until the gums are un-even).