Hello, the harm of teeth is slurred speech: soon you will have a toothache and slurred speech. Extraction: Most orthodontists need to extract 24 teeth to make room for tooth movement. Soft tissue contusion: after wearing orthodontic appliance, the running-in process is more painful. Bleeding, soreness, scratches and ulcers are commonplace, which is also one of the hazards of orthodontics. You should be mentally prepared. Change of face: Although orthodontics not only corrects the shape of teeth, but also pays attention to the change of face, many friends will find that their face is not as good as before after orthodontics.