More and more adult patients are opting for orthodontic treatment. They require a special approach and an experienced orthodontist, but also cooperation with other dental specialists. The reason for this are different conditions in the oral cavity. In adult patients we find restorations, worn teeth, prosthetics, loss of tooth tissue and periodontal problems. They usually go into treatment because of the shortcomings that have plagued them since adolescence, but they have not previously had the opportunity for treatment, or as part of a broader dental plan. Lack of space in the area of prematurely lost first molar and mesialization of the second molar, anterior cervical defects that impair aesthetics, middle diastema, and crowded and rotated incisors are the reasons for initial orthodontic treatment before prosthodontic treatment. It is advisable to make a diagnostic setting to avoid disappointment at the end of treatment. Periodontal problems often accompany adult patients, so it is necessary to perform initial periodontal therapy before orthodontic. The unaesthetic appearance of the gingiva is usually part of periodontal therapy, such as excessive visibility of the gingiva, loss of the interdental papilla, and uneven vertical position of the gingival margin. Restorative treatment is often an option that patients are prone to because of the more affordable price and duration of the treatment itself as opposed to prosthetics. Temporomandibular disorders are often associated with poor occlusal relations and may be the reason for an orthodontic refferal, however this cause-and-effect relationship has not yet been confirmed.