So how to treat a small chin? First of all, we need to define the definition of a small chin. In layman’s terms, a small chin is a short length or a backward position relative to the upper jaw. In this case, the upper jaw is relatively forward and the lower jaw is relatively backward, and the facial shape will present the so-called buck-tooth shape. So how can a small chin be treated? Here we talk about the treatment of a typical small chin, which means that there is mainly only a small chin problem and no other problems, or other problems are relatively minor. The first phase of treatment should address the problem of the small chin, which should be treated at the late teething stage or early permanent dentition; i.e. 11 to 13 years old for boys and 9 to 11 years old for girls, when the growth spurt of the child has not yet arrived, the patient’s growth potential can be fully explored with the use of relevant orthodontic appliances to stimulate the growth of the lower jaw and inhibit the growth of the upper jaw, to achieve The aim is to harmonize the growth of the upper and lower jaws. This phase of treatment usually takes one to one and a half years. The second phase of treatment will take perhaps a year to a year and a half to align the upper and lower jaws and to correct the occlusal relationship. The key to the treatment of a small chin is timing. The age of 11 to 13 for boys and 9 to 11 for girls is the best time to treat most children with minibars (the rationale is to take full advantage of the patient’s growth potential). Of course, with today’s technology, it is now possible to induce a small chin to grow forward in older children (14 to 16 or even before 20), but the results are not as certain as in the previous age groups, and there is a possibility of failure. For patients who are unable to induce chin growth, the treatment is more complicated. In the case of adults with a small chin, there are only two methods: 1) extraction, i.e., extraction of the upper front teeth to disguise the bony problem, with the risk of facial deformation after treatment, as in the example described at the beginning of this article 2) orthognathic surgery, where the chin is surgically guided out. Because it is a surgery, the cost is much higher. The following two case illustrations illustrate the treatment of a typical small chin. It should be noted that patients with small jaws may also have some problems, such as crowded teeth, but generally speaking, small jaws are the most important shield in this type of problem, and once the main shield is solved, other problems will be easier to solve. For children, if parents find that the child has a problem, they should go to the hospital for an examination in order to determine the best time and plan for treatment. For adult patients, treatment is also possible, but the solution will be more complicated, with the possibility of extraction and, in the most severe cases, surgery.