Many patients or parents always have a concern before orthodontic treatment: will orthodontic treatment damage the health of the teeth? Will orthodontic treatment affect the life of the teeth? Here I will briefly answer these patients’ concerns. First, let’s look at why people’s teeth are damaged and lost? There are many people who believe that it is normal for people to lose their teeth when they get older, but in reality this view is wrong. As a modern person, there are two main causes of tooth loss: 1, tooth decay; 2, periodontal disease. Tooth decay, which we often say is tooth decay, is actually due to bacteria producing acid slowly eroding the tooth. 2, periodontal disease, periodontal disease is due to bacterial infection causing inflammation of periodontal tissue, slowly absorbing and receding the bone around the root of the tooth, resulting in the tooth loosening and falling off (like the tree falling down after water and soil erosion), unlike tooth decay, the tooth loosening and falling off from periodontal disease is often more complete. Modern medicine proves that these two kinds of dental diseases can be prevented and treated. As an individual, one should do a good job of oral hygiene (mainly also means brushing and the use of related oral cleaners). If there are problems associated with the teeth, treat them promptly. According to the current international standard, individuals should achieve 8020, that is, they should still have 20 usable natural teeth at the age of 80. Let’s go back to the basic principle of orthodontics: giving a suitable force to the tooth to change its position in the alveolar bone. The process of changing the position of the tooth is very slow and the patient usually does not feel the loosening of the tooth. The tooth will then rebuild the periodontal tissue in its new position and function in parallel. This process does not lead to the development of caries or periodontal disease. Of course, orthodontics itself will not directly damage the teeth. Numerous studies, both nationally and internationally, have shown that patients who have undergone scientific orthodontic treatment have a longer life expectancy than the general population. This is mainly due to two points: 1, in the process of orthodontics, a variety of tooth-related diseases done systemic treatment; 2, after orthodontic patients, often have a strong awareness of oral health care and correct oral health care methods. Therefore, scientific orthodontics will not damage the health of the teeth. It should be emphasized that we say that scientific orthodontics will not harm the health of the teeth. What about if the orthodontic treatment is not scientific? The answer is indeed that it can harm the health of the teeth. This is from two aspects: on the one hand, from the doctor’s point of view, orthodontics involves more aspects, so the doctor should have a more comprehensive knowledge base, in the patient should be seriously responsible for the development of a scientific and reasonable treatment plan, and standardized implementation, in order to achieve the desired treatment results. We sometimes receive cases of poor orthodontics elsewhere in the clinic, where the patient’s teeth are often damaged due to improper treatment. On the other hand, from the patient’s point of view, he or she should cooperate as requested by the doctor. In particular, it is important to maintain good oral hygiene and keep the teeth clean. The braces make it easier for food to remain on the teeth, so the frequency of brushing should be increased and changes in brushing methods should be made (the doctor will give an explanation) in order to maintain oral hygiene. Occasionally, we do see patients who do not like to brush their teeth (mostly teenagers who are rebellious), and if there is a possibility of serious damage to the health of the teeth, these children are advised to abandon the treatment. So, in short, scientific orthodontics will not harm dental health.