Why the air expelled from the mouth is smelly while the air expelled from the nose isn’t?
In: Biology
Your mouth is filled with millions of harmless bacteria which eat food particles left in your mouth and expel smelly gases as a byproduct. Your nasal passage is mostly bacteria free.
It also comes down to desensitization. Much like your nose always being in your vision. Your brain tunes of the smell of your nasal cavity naturally so it can do it’s job.
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