The old-timers used to snort salt water which acted as a brine to toughen up the nasal cavity. I don't recommend it. With time you'll get used to getting hit on the nose and won't bleed as much. Same with the lips. Those are usually the first places you will bleed after sparring. For that reason I would avoid the full-face protection head gear. If you use it for sparring you will bleed like a pig during a real fight.
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