Why one should not breath through mouth ?

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Solution

One should breath through nose as nose is lined with mucus and have fine hairs. These hairs trap the dust and pathogens and don't allow them to enter the body. Also the air get warmed before it enters the lungs.
Our mouth does not have fine hair and thus won't be able to trap dust and pathogens and prevent their entry in the body. So, we should not breath through our mouth.

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They started playing and at the end of the game, all three of them were panting and breathing heavily. Sam noticed that John was breathing through his mouth so he advised him to breath through nose and not through mouth.

To this Kenneth said ' how does it matter? we will be inhaling the same air whether we breathe through nose or through mouth'.

Sam gave a reasonable explanation to make Kenneth and John understand that they should breathe through our nose and not through our mouth.

What was explanation given by Sam?

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