The word "Lingual" means the tongue side of the teeth. There are different types of this system using roughly fabricated or custom-made brackets. Brackets are glued to the inner surfaces of the teeth facing the tongue instead of the outer surfaces.

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Lingual orthodontics is the most aesthetic form of orthodontic treatment performed by gluing the brackets to the back surface of the teeth, thus making the wires invisible. It is an ideal treatment, especially in the treatment of adult patients. The brackets applied are completely different from the brackets applied to the front surface of the teeth. Since the structure of the back surfaces of the teeth show different slopes and surface properties compared to the front surfaces, these brackets are indirectly bonded to the teeth as a result of a special laboratory process.

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There are also special treatment methods known as Incognito and Harmony in lingual orthodontics. In these techniques, gold and nickel-titanium alloy brackets that can be completely adapted to the patient's teeth are produced with the CAD/CAM system. The treatment is applied with wires containing twists specially prepared for the patient.