The first one is

Traditional wire orthodontic treatment.

The second type is the most popular invisible correction, fully transparent thin appliance, which is comfortable and beautiful.

The third is the most advanced and fastest beauty crown correction.

The principle and time of the first steel wire brace are the same as the second. All of them are pulled by external force, mainly for full or half mouth correction, which will be corrected in about 1~2 years. Invisible orthodontics is a kind of pure transparent appliance without brackets, which can't be seen when worn.

The third kind of beauty crown orthodontics mainly aims at a single correction of your ugly teeth, which is mostly completed by adults and lasts for about 7 days. What is not good-looking, the price is charged according to the quantity.

The second and the third are many choices for stars at present.