Owie... I tripped and fell down again... You're bleeding!! That won't be necessary. *haaaaaack* I have a better idea. Huh? What are you gonna do? I'm gonna cauterize it!! Let me heal you with my spit! Seriously, don't do this. Saliva might contain some anti-bacterial and tissue factors, but it's just not sanitary. Your mouth is also full of microorganisms which could contaminate the injury.