Preventive treatment is an orthodontic treatment method that will enable children with some harmful habits that can disrupt their jaw and tooth structure to give up these habits, usually with the help of special appliances. These harmful habits are finger, pen, tongue sucking, wrong swallowing, mouth breathing, etc. such as habits. If such harmful habits are not treated, they can cause serious orthodontic disorders in the future. Therefore, children with such habits must be examined.