Success of an orthodontic treatment is affected by the patients periodontal health status, so without periodontal suppport, it is impossible to get an ideal result. This is why orthodontics need to work as a team with periodontology. Today, orthodontic treatments are not just preffered by pre-adolescent patients, but also by adult individuals over the age of 35. Unfortunately, patients visiting our clinics do not always have healthy periodontal tissues. Usually they have mild to moderate periodontal problems when they come to the clinic. In this review, patients will be discussed in two groups as periodontally healthy and periodontally compromised. Also questions such as: "Does orthodontic treatment cause periodontal problems?", "Do mechanics used in orthodontic treatment affect periodontal tissues?", "What are the treatment options in periodontally compromised patients?", "What can be done to prevent relapse after treatment?", "Is it possible to have ideal result in esthetic problems with the collaboration of orthodontics and periodontology?" will be answered in this review