Low vertical distance of the teeth, which is usually manifested as shortness of the lower 1/3 of the face, can be associated with occlusal disorders and temporomandibular joint disorders. It may be related to factors such as heavy wear on the occlusal surface of the teeth, bad habits, and missing teeth for too long. 1. Heavy wear on the occlusal surface of the teeth: when people bite too tightly, have bad habits such as grinding teeth at night, or like to eat too hard food, the occlusal surface of the teeth can be overly worn, and the whole crown becomes shorter, which can cause the vertical distance of the teeth to be too low. 2. Lack of teeth for a long time: because of the lack of teeth for a long time, resulting in alveolar bone resorption, alveolar bone height, width are smaller, which can make the vertical distance between the teeth is too low. There may be other reasons for the low vertical distance between teeth, we should consult the doctor in time, improve the examination, clarify the cause and diagnosis, and standardize the treatment under the guidance of professional doctors to avoid adverse effects.