At the end of the first phase of treatment, the teeth are not in their final positions. A successful first phase will have created room for permanent teeth to find an eruption path. Otherwise, they may become impacted or severely displaced.
The next phase is known as the resting period. At this point the permanent teeth are left alone as they erupt. Retaining devices may or may not be recommended, depending on if they would interfere with eruption. It’s best to allow the emerging permanent teeth some freedom of movement.
During this time occasional appointments for observation are necessary, usually on a six-month basis.