Adults with deep overjet jaws generally need to be corrected, and severe deep overjet jaws that are not corrected can lead to anterior tooth wear, inefficient mastication, temporomandibular joint disorders, and other adverse effects. 1. Anterior teeth abrasion: deep overjet will cause excessive friction between upper and lower front teeth, the lingual side of maxillary front teeth and the labial side of mandibular front teeth will produce non-physiological abrasion, which will lead to abnormal morphology of anterior teeth, affecting aesthetics and function. In severe cases, dentin is exposed, causing dentin sensitivity. 2. Inefficient mastication: Due to the abrasion of the anterior teeth, the morphology of the anterior teeth becomes thinner and shorter, and an effective occlusal contact cannot be achieved, which reduces the efficiency of mastication and affects digestion. 3. Temporomandibular Joint Disorder (TMJD): Long-term deep overjet leading to tooth abrasion will cause the occlusal relationship to become unstable or even change, and the temporomandibular joints and the surrounding muscles are strained, resulting in temporomandibular joint disorder (TMJD). If the above symptoms occur, it is recommended to go to the hospital in time to receive regular treatment.