Patient: Since I was a child, I have been using my tongue to push my teeth outward, and now I am eight years old, my upper and lower teeth are protruding outward, and I cannot bite my upper and lower teeth together. How can I change my bad habits, and if I need orthodontic treatment, when and how should I do it? Li Song, Department of Orthodontics, Beijing Dental Hospital: It seems that your daughter’s tongue habit is still quite stubborn, it is recommended to wear a tongue habit buster orthodontic appliance as soon as possible to correct her bad habits, so as not to cause more impact on the teeth and facial shape.