Nowadays, orthodontics is no longer the patent of children, more and more adult patients have joined the team of orthodontics, in the final analysis is for “love of beauty” considerations, including the symmetry, harmony, coordination and other visual “comfort and beauty” of the teeth, mouth and lip and facial form “, also includes the restoration of the mouth and teeth function of health, comfort, stability and other physical and mental “pleasure and pleasure”. Love of beauty is a human instinct, not a human extravagance. However, most adults who have orthodontic treatment have a doubt: I am already an adult, can my teeth still receive orthodontic treatment? If I straighten my teeth, will it be easy to loosen and fall off in the future? Will there be any after-effects? For orthodontic treatment, age is not a limiting factor. The decisive factor for orthodontic treatment is the periodontal condition of the teeth, which is the part of the tooth root encased in bone. As long as the periodontal condition of the teeth is healthy, orthodontic treatment is acceptable. Periodontal health is evidenced by stable teeth without looseness, adequate root length, no root exposure, thin gum margins without redness or swelling, and no bleeding from brushing teeth. When there are conditions such as loose teeth, exposed roots, and red and bleeding gums, a professional evaluation is required for orthodontic treatment, and there are certain risks. Patients with teeth that are aligned but in good periodontal condition. Patients with teeth that are aligned but in good periodontal condition. The patient has a backbite of the anterior teeth, which produces occlusal trauma and leads to root exposure and tooth loosening of the mandibular anterior teeth. (Part shown by arrow) The patient had poor oral hygiene with red and swollen gums, tooth buildup, resulting in exposed roots of the mandibular anterior teeth and loose teeth. (Part shown by arrow)