Rabbit teeth are the two central incisors in the upper jaw, which are relatively long. Buck teeth refer to the protrusion of the upper jaw. Rabbit teeth are very expressive, indicating that the two central incisors on the upper jaw are relatively long. When the mouth is opened, the central incisors on the upper jaw can be clearly seen. Normal people can see the 1mm incisal end of the maxillary central incisor by opening it slightly. If it exceeds 1mm, the maxillary central incisor is longer, commonly known as rabbit teeth. Buck teeth are the protrusion of the maxillary bone, which is an overdevelopment of the maxillary bone, causing the middle part of the face to protrude forward. The occlusal relationship becomes deep overjet or deep overjet in the anterior teeth area, so there is a difference between the two. If there are rabbit teeth that can grind teeth, if there are buck teeth, orthodontics or orthognathic surgery will be necessary.