There are several reasons for the onset of malocclusion, which promotes disharmonious development of the craniofacial structure and may involve various factors such as incorrect positioning of teeth, maxilla, mandible, lips, tongue, and/or cheeks, possibly accompanied by deleterious oral habits. Malocclusion is a common finding that affects facial aesthetics, smile, as well as masticatory and respiratory functions, occurring in a large portion of the world’s population. Hence, a correct and early diagnosis is necessary for malocclusion treatment. There are various available treatments aiming for early correction of malocclusions. This clinical case report will describe a possible treatment for correcting an anterior open bite during the mixed dentition associated with a deleterious oral habit. The Balters’ Bionator is a functional orthopedic dento-muco-supported appliance that harmonizes the muscles of the tongue, lips, and cheeks, and treats skeletal discrepancies. At the end of this orthopedic treatment stage, the patient achieved the objectives of this work and will continue her care in a pediatric dental clinical setting at the Federal University of Amazonas-UFAM for further analysis and additional dentomuco-skeletal corrections.