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The reasons already given for why breathing through ones nose are well known and valid. There are completely separate reasons why it is unhealthy to breathe through the mouth. As everyone knows, there are lots of bacteria in the mouth. One of the functions of saliva is to wash away bacteria resulting in thier being swallowed. A dry mouth tends to result in increased tooth decay, periodontal disease, and gingivitis.

Breathing though the mouth causes the saliva to evaporate causing "dry mouth" (there can be any of several other causes for the condition of dry mouth), which creates a more friendly environment for harmful bacteria to grow.

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13y ago

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