Large gaps in the front teeth may be caused by underdevelopment of the front teeth, abnormal attachment position of the labial tie, periodontitis, occlusal trauma and so on. 1. Incomplete development of the front teeth: the enamel and dentin of the front teeth are not fully developed, resulting in the congenital formation of gaps in the front teeth. 2. Abnormal attachment position of the labial tie: If the labial tie has an abnormal attachment position, such as attaching to the gingival papilla between the front teeth, it may cause gaps in the front teeth. 3. Periodontitis: Periodontitis causes alveolar bone resorption and gum recession, which may cause gaps in the front teeth. 4. Occlusal trauma: Occlusal trauma may cause the front teeth to shift pathologically, which may cause gaps in the front teeth. There may be other reasons for the gap in the front teeth, it is recommended to go to the hospital in time, under the guidance of the doctor to give targeted treatment or treatment.