The most common query I hear in the clinic is: “They say that teeth can easily loosen after orthodontic treatment”; or “They say that teeth can easily loosen and fall out after extraction orthodontic treatment”. I am an easily agitated person, and when I hear such statements, a fire rises in my chest. I don’t know who the magical “they” is that has deceived so many people. 1, the teeth will definitely loosen and fall off? European and American countries put forward the concept of 99.77.22, meaning that 99% of people have at least 22 healthy teeth at the age of 77. Japan also put forward the slogan “80.20”, meaning that the people have at least 20 healthy teeth at the age of 80. The Chinese have always believed that as we age, our teeth will loosen and fall out. The most important cause of loose teeth is periodontal disease. Compare a tooth to a tree and the surrounding bone to soil. When the soil is lost, the tree falls; when the bone is absorbed, the tooth falls out. Soil loss can be controlled, and bone resorption can be prevented. I would tell my patients: As long as I don’t crack my teeth or knock them out, I am confident that I will have a full mouth of teeth when I close my eyes forever. Specific care methods can go to self-learning, interested in reading my article, I believe there is no shortage of so many minutes to learn a lifetime of oral health care knowledge. 2.Will orthodontics cause loose teeth? The answer is yes. Orthodontics is the purposeful movement of teeth, loose loose loose, loose will move. So in the process of orthodontics, teeth will definitely be looser than usual, as long as the treatment is proper, those loosening are non-pathological. 3.Is the loosening of teeth caused by orthodontics permanent, or will the teeth loosen after orthodontics in old age? In fact, orthodontics is a process of periodontal tissue reconstruction, what we do is not demolition, but the physiological movement of teeth based on science and completed under the condition of ensuring health, and the periodontal tissue will complete the reconstruction after stopping the force, and the teeth will be restored to be stable. Of course, the prerequisite is that you receive regular orthodontic treatment, pay attention to oral hygiene during the orthodontic treatment, and brush your teeth carefully and cleanly.