Random fact:
The Komodo dragon kills its prey by biting them, and giving them a nasty case of septic shock, because Komodo dragons have such shitty oral hygiene that their saliva is on the level of some venoms.
Fun fact:
The human mouth is almost as bad.
If you were to randomly bite someone hard enough to break skin, or spit into their wounds, there's a good chance they'd end up needing serious medical attention.