If theres billions of bacteria in our mouths, how come when we cut our inner lip we’re not guaranteed an infection?

Question

If theres billions of bacteria in our mouths, how come when we cut our inner lip we’re not guaranteed an infection?

In: 85

Answer 1

>If theres billions of bacteria in our mouths, how come when we cut our inner lip we’re not guaranteed an infection?

Actually, you ARE guaranteed an infection. Every time there is a breach in the skin, there is an infection. Bacteria and viruses get in and start wreaking havoc. However, your immune system is quite adept at countering infections, so you may not even notice that it’s happening.

Kurzgesagt did a [great video](https://www.youtube.com/watch?v=lXfEK8G8CUI) on infections and the immune system.