Agreed, and presumably there's evolutionary factors here too. If you can't eat you die - having a wound in your mouth that reduces your ability to eat is not go

Agreed, and presumably there's evolutionary factors here too. If you can't eat you die - having a wound in your mouth that reduces your ability to eat is not good, so there must be strong selective pressures for tissues that can regenerate rapidly. I guess the selective force in the opposite direction might be the caloric demands of healing, hence why we don't regenerate too rapidly.