Hello, it is necessary to wear braces, that is, braces. If the teeth are too crowded, the doctor will calculate to remove the extra teeth, and then move the teeth to the correct position with braces. This process usually takes one year, and then the teeth that have been arranged will be preserved according to the specific situation, that is, the retainer will be used. This is removable and can be taken off by yourself, usually when sleeping at night.