We humans can bite fairly hard when we want to. We use our jaws to bite through food every day, and like any muscle, the more you use your jaw muscles the stronger they become. The average human can generate up to 200 pounds of bite force, leveling off at around 70 pounds per square inch. We have the necessary force to easily bite off a finger, but our brains stop us from doing so. To put our bite into perspective, the strongest bite in the animal world belongs to the gigantic and terrifying Hippo, which has a bite force of 1825 pounds per square inch.