Cheetahs have sharp teeth, but compared with other big cats, their teeth are smaller. Cheetah's head is smaller, so its upper jaw is smaller, so it can't grow roots. In addition, its teeth can't become very long. As we all know, if a tooth is very long, it takes a very long root to break it. If the root of the tooth is short and the exposed part of the tooth is long, it is easy to break when biting. Therefore, cheetahs have smaller teeth. Therefore, the whole body structure of cheetah seems to be specially designed for running speed, which is forced by natural selection. Ten thousand years ago, the ancestors of cheetahs were still very big, but those ancestors died out because they didn't adapt to the environment. These cheetahs that are left behind now, they all run very fast, and their body structure has also undergone great variation. Because running consumes a lot of oxygen, in order to absorb more oxygen, cheetahs have large nasal cavities. Therefore, there is not much room in its skull to grow roots, so its teeth are shorter. As we all know, predators in nature rely on their claws and teeth when fighting. The cheetah's teeth are short, which greatly affects its combat effectiveness.

In the nature where the fittest survive, cheetahs are often killed and eaten by some big cats, such as lions. Because cheetahs have short teeth, cheetahs sometimes can't kill food with their teeth. Often relying on the chin is like a pliers to clamp the neck of the prey and suffocate the prey. The cheetah's predation mode is generally like this: although it runs fast, because of the limited distance, it will try to get closer to the prey step by step and try not to let the prey find it. Only when it is close enough, it will suddenly jump out and pounce on the prey. Cheetah mainly catches prey by speed. If it can't catch it the first time, its prey has a great chance to escape.