When it comes to the tongue, every human heals almost as fast as the X-Men character Wolverine. Biting your tongue or chewing on your cheek can ruin even the tastiest meal. Luckily for you, that pain usually does not last very long. According to research, mouths are constantly primed for healing. There are two reasons for this. The first is that the mouth is filled to the brim with bacteria, and if small cuts did not heal fast, you would get infections all the time. The second is that if you stopped eating due to the pain, you would quickly starve.