The lack of space in the dental bed makes it impossible to align all the healthy teeth neatly, resulting in crowding and misalignment, the front incisors exceeding the lips (anterior protrusion), and the last developing wisdom teeth at the back being at an incorrect angle and not in position to emerge (blocked teeth). Imagine: if all the teeth are forcibly aligned without extraction, the result will be 1) more protrusion of the front teeth, 2) pulling of the roots to the outside of the bed bone, and 3) confusion and instability of the bite. Therefore, extracting individual healthy teeth to solve the whole big picture of crowding and chaos, and gaining aesthetics, more than 100 years of orthodontic history has proved that extracting teeth under the condition of insufficient space in the dental bed is more stable and healthier than not extracting teeth for orthodontic treatment. Side effects? Healthy teeth, protected by enamel, are relatively closed and independent individuals with their own separate vascular nerves. In the case of dental disease, the symptoms of toothache are intolerable and the degradation of the tooth bed and the loosening of the teeth are not related to the extraction of teeth for orthodontics, there is no causal relationship. Before determining the extraction plan, the x-ray and the measurement of the dental model are the orthodontist’s process of repeatedly searching for the remaining space in the dental bed. Reasonable extraction locations, emptying the right size space, are fully and rationally utilized.