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Breathing by nose has a number of advantages.

Firstly, hair and mucus in our nose help in filtering out foreign materials, dust, allergens, etc. Secondly, nose breathing releases more nitric oxide, which is ultimately responsible for more release of oxygen. Lastly, nose adds warmth and moisture to inhaled air. This makes it more suitable for our respiratory tract.

Breathing by mouth has the following disadvantages.

Firstly, breathing by mouth dries up our saliva. As there is very less saliva, it is unable to protect us against harmful pathogens. Secondly, in children, continuous mouth breathing may lead to crooked teeth or minor jaw deformities. Thirdly, experts believe that mouth breathing can lead to lack of oxygen in our body. Lastly, mouth breathing also leads to sleep apnea. Sleep apnea results in sleep deprivation which causes fatigue and exhaustion.