One of the methods of orthodontic treatment is the extraction of one incisor in the mandible. It is most often used to eliminate crowding in the lower arch. Material and methods: Google Scholar and Pubmed online medical databases were searched. After the analysis, 8 case reports describing orthodontic treatment in class I patients were selected. Results: All cases involved the treatment of young people (age range: 12–19 years old) with crowding in the lower or upper and lower arches. Conclusions: The choice of orthodontic treatment with the use of extraction of one of the mandibular incisors must take into account many factors and be preceded by an individualized treatment plan.

Key words: orthodontic treatment; lower incisor; extraction, class I malocclusion.