A “tiger tooth” is actually a labially oriented misalignment of the maxillary cusp. It protrudes outside the dental arch and looks a bit like a considered tooth from the side, hence the image of a “tiger tooth”. “Tiger teeth” is a common malocclusion, it grows outside the dental arch, can not bite with the opposing teeth, lost chewing function, it from the inside against the lips, making people feel uncomfortable, and sometimes also cause lip ulcers. When hit by external forces, it is easy to make the lips injured. The position of “tiger teeth” is also higher, so it is not easy to clean when brushing teeth, and it is easy to have gum bleeding and tooth decay. What’s more, it is unsightly and affects the beauty of the face. Some people think that “tiger teeth” are extra teeth, and some people think that it is less trouble to pull out “tiger teeth”. These views are not correct and can lead to big mistakes. Why “tiger teeth” can not be easily removed? The reason is that it is an important tooth in the oral cavity, the “tiger tooth” is a normal tooth growing in the wrong place, not redundant, it is a very strong tooth in the oral cavity, the root is long and strong, the tip is sharp and powerful, can tear the food. It can bite very hard food. It plays an important role in chewing function. Another important role is to set off the normal fullness of the face and keep the face beautiful, if it is removed, it will cause facial depression and change the face. If it is removed on one side, it can make the two ends of the mouth angle asymmetrical. It can be seen that “tiger teeth” cannot be easily removed. How are “tiger teeth” caused? There are several reasons for this: ① Retained milk cusp teeth. (2) Early loss of milk cuspids or milk molars and forward displacement of the teeth behind them. (3) The presence of multiple teeth. All of these conditions can cause the permanent cuspids to erupt with insufficient space, so they can only erupt on the labial side where there is less resistance, forming a misalignment. The “tiger teeth” can be corrected by orthodontic treatment, and the common treatment is to remove the first premolar and reset the ectopic cusp.