Reverse jaw cannot be clearly identified as its exact cause, but it is mainly categorized into two main groups: genetic factors and environmental factors. 1. Both parents pass on the malocclusion characteristics to their children so that the children’s maxillofacial pattern resembles that of their parents, but at the same time, not all the children’s maxillofacial pattern resembles that of their parents, which in turn is related to mutation. Disharmony between the size or shape of the upper and lower jaws may be passed on to the offspring, causing abnormalities in the relationship between the upper and lower jaws or between the upper and lower jaws, resulting in the formation of antomandibulars. 2. Environmental factors include congenital factors and acquired factors. Inadequate development of the maxilla at birth may lead to the formation of antimandibular. Acquired bad oral habits, such as frequent stretching of the tongue may result in antimandibular. It is recommended to consult a professional doctor.