The cause of buck teeth formation may be related to genetic factors, bad oral habits, early loss or retention of milk teeth and other factors. 1. Genetic factors: The formation of buck teeth is closely related to genetic factors. If the parents are bucktoothed, the possibility of the children suffering from congenital bucktooth will increase. 2. Bad oral habits: In the process of children’s maxillofacial growth and development, the teeth and facial shape are constantly developing and perfecting. If there are bad habits, such as open mouth breathing, tongue stretching and spitting habits, biting the lower lip habits, can cause buck teeth. 3. Early loss or retention of milk teeth: Normal milk teeth have an inducing effect on the eruption of permanent teeth in the correct position, if the milk teeth are lost early, they will lose the inducing effect on the permanent teeth, which will cause buck teeth due to the insufficient eruption position of the permanent teeth; the retention of milk teeth can also lead to the blockage or eruption of the permanent teeth in the wrong position, which will cause buck teeth. If you find buck teeth, you should consult a doctor in time, improve the examination, clarify the cause of the disease, and standardize the treatment under the guidance of a professional doctor.