The treatment of constricted anterior arch in adult patients is challenging for orthodontists because transverse correction of maxillary arch requires surgical approach and transversal change interacts with vertical and sagittal changes correspondingly. This case report introduces a nonsurgical treatment of adult patient with constricted anterior arch and unilateral scissors bite. The anterior maxillary expansion was obtained by rapid palatal expansion (RPE) without the use of mini-implants. Semi-fixed anterior bite plate was used for deep bite correction, and it resulted to spontaneous mandibular expansion. The patient was satisfied with the successful nonsurgical orthodontic treatment which showed favorable occlusion and harmonious facial profile.