Incisors can be straightened if they do not adjust themselves during the tooth replacement period. Incisors are the front most teeth in the mouth, four on the top and four on the bottom, eight in total, and are easier to pay attention to because of their position in the middle of the face. The incisors may change somewhat during the development of the teeth. In the case of children in the period of teething, the incisors will have erupted by the age of seven or eight. At this stage, there will be a brief gap between the central incisors, that is, there will be a gap between the incisors. During the eruption of the lateral incisors and cuspids on both sides, the gap between the teeth may disappear on its own, and if it cannot disappear, the presence of multiple teeth needs to be ruled out. If there are multiple teeth, they need to be extracted as soon as possible. The development of teeth is faster than the development of jawbone. At the age of seven or eight, the development of jawbone is not completed, while the incisors have fully erupted, so it may appear that the incisors are larger, which is only a temporary stage. After the development of jawbone is completed, the teeth and jawbone will be more compatible, and the incisors do not need to be corrected. If the incisors are crowded or misshapen, orthodontic treatment is needed to align the teeth by bonding brackets to the teeth. Therefore, some incisors can be adjusted by themselves during the period of tooth development, and orthodontic treatment can be performed after the teeth have been replaced.