Many elderly people will say: “If you correct your teeth now, they will fall out faster when you are old. And there is a Chinese proverb that says “If you don’t listen to the old man, you will suffer before your eyes”. So many parents face their children orthodontic things that they have not experienced, while encountering the advice of the family suffered from toothless elderly, parents immediately into confusion. This can not blame everyone, because the real development of orthodontics in our country is also a matter of these ten years, the real mastery of orthodontic technology dentists are not many; not to mention the seventy to eighty years old. Orthodontics is loaded by force to the orthodontic appliance glued to the teeth, thus guiding the teeth to slowly grow to the position designed by the doctor. The process is slow and at the same time does not harm the teeth or the bone, which grows well at the end of the orthodontic treatment. However, the amount of force to be used, the position to which the teeth should be moved, how to ensure that the teeth move according to the design, etc., all require professional orthodontic knowledge. Therefore the training of a professional orthodontist often requires 3 years of training after a bachelor’s degree in dentistry, which is 3 years of master’s study. There are two main reasons why people lose their teeth. One is tooth decay, where the entire tooth is hollowed out. The second is periodontitis, where the bone around the tooth is resorbed due to the long-term erosion of inflammation, and eventually the tooth is lost; just like soil erosion. And the inflammation around the teeth is caused by dental plaque microorganisms, dental calculus, etc. When teeth are straightened and straightened, it is easier to remove dental plaque with regular brushing. So just the opposite, after straightening teeth, teeth will be less likely to fall out because they are easier to clean.