The Mandalorian S3E2: The mines of Mandalore (Spoilers)

The whole " you can never remove your helmet" bothers me. It seems you`d be very limited in what you could eat, not to mention shaving, or cutting your hair. I would like a little more details on the rule. I mean once a month in private so you could wash your face, clean your ears, and eat a plate of ribs isnt asking too much. Relations between 2 mandolorians would also seem difficult.