The author treated 3 class I malocclusion patients with the lingual appliance followed by the extraction of the 4 bicuspids. One of them was finished with the labial appliance at the final stage. The treatment results were acceptable and the patients had good tolerance to the lingual appliance without complaints in these cases. There were some problems in treatment on the lingual side both the patient and the practioner, but I think we can overcome them with the development of the orthodontic materials, the treatment technics & the increased clinical experience. Of course, we cannot treat all the patients with the lingual braces, but patients are carefully selected, lingual braces will be a valuable orthodontic appliance. In conclusion, the lingual braces have very good esthetic advantages, so the patients, especially in adults, who hesitate or refuse the orthodontic treatment due to the esthetic problem of the labial braces will get the motivation & the chance for the orthodontic treatment.