When an occlusal interference occurs in a child, they will often posture their mandible forward to avoid the interference. Although this allows them to maximize their ability to chew with their posterior teeth, it creates a pseudo Class III Anterior Crossbite or an end-to-end anterior bite. Over time, this abnormal function will direct the mandible to grow forward, inhibit the growth of the pre-maxilla and create a skeletal Class III. Anterior crossbites of this nature need to be treated as early as possible. The simplest way to do so is to first eliminate the source of the interference and then move the inhibited pre-maxilla back to its normal position with an appliance like the one shown here. In this appliance, the entire anterior segment is moved labially with an expansion screw placed in the sagittal position. The labial arch wire moves with the segment as a unit while the posterior teeth are used for anchorage. A posterior bite plane is necessary if the anterior teeth are already lingually locked behind the lower incisors.