HEre we hardly brush our teeth so be awar of trench mouth. IF you start to have severe gum pain, you know you got it. your gums would start to bleed even if you just touch it slightly. Also, Dysentery inflamation disorder in the intestine . All i have to say about that is sorry.Soldiers who are aware of this danger in the trenches sometimes opt instead for the 'in the hat' method. Their was no washing or shaving , and the demands of nature answered as quickly as possible in the handiest and deepest shell-hole.
Be comfortable to go days without taking a shower and even changing your clothes. There is no time for that. Plus do you see a shower or sinks around here? The smell is terrible but after a while you will get used to it.
BAd hygiene will lead to some people getting trench fever. we have no toilet paper to wipe our A$$e$ after using the restroom. If you need to pee, just go in your helmet and dump it somehwere. People could barely survive in the trenches due to them not being able to clean themseles.