Patients with crooked teeth can take the following treatment measures respectively: First, for mildly crooked teeth, a small amount of enamel can be abraded and resin veneers can be applied to make the teeth inward, or all-porcelain veneers can be made to improve the appearance. In the case of moderate crookedness, dental preparation can be carried out, after grinding and changing the direction of the tooth, porcelain or all-ceramic crowns can be made to restore the tooth, and if necessary, root canal treatment can be carried out on the affected tooth to make pile cores and adjust the direction of the long axis of the tooth. Third, when multiple teeth are crooked and crowded, wisdom teeth and bicuspids can be extracted to obtain orthodontic space, while wearing invisible or fixed orthodontic appliances, traction all teeth to move, align the teeth and establish normal occlusal relationship. Fourth, wisdom teeth that are tilted proximally or buccolingually can be extracted directly without restoration to prevent repeated infections.