Why is it when we get a cut in our mouth(the dirtiest place ever) does it not get immediately infected? ELI5
In: Biology
The other commenters are exactly correct, but here’s some more detail. The surface of your entire digestive tract, from mouth to butt, has a layer rich in immune system cells because these areas are so delicate and also filled with bacteria. This layer is called the lamina propria. [Wikipedia has a diagram](https://en.wikipedia.org/wiki/Lamina_propria).
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