View source for Mouth breathing

{{SignSymptom infobox |
  Name        = Mouth breathing |
  ICD10       = {{ICD10|R|06|5|r|00}} |
  ICD9        = {{ICD9|784.9}} |
}}
'''Mouth breathing''' refers to the state of [[inhaling]] and [[Exhalation|exhaling]] through the [[mouth]].

A healthy individual normally breathes through the [[nasal breathing|nose]] while resting or doing light exercise, and breathes simultaneously through both the nose and mouth during vigorous [[aerobic exercise]], in order to supply sufficient oxygen.  

Excessive mouth breathing is problematic because air is not filtered and warmed as much as when inhaled through the nose, as it bypasses the nasal canal and [[paranasal sinus]]es, and dries out the mouth. Mouth breathing is often associated with congestion, obstruction, or other abnormalities of the upper respiratory tract. Mouth breathing is a diagnostic sign of [[adenoiditis]] especially with persistent [[rhinorrhea]].{{Fact|date=May 2010}} [[Comorbidities]] include [[asthma]], [[obesity]], [[snoring]], [[halitosis]], and obstructive [[sleep apnea]].{{Fact|date=May 2010}} Mouth breathing in children can be a cause of abnormal facial growth primarily in the upper and lower jaw shape, leading to [[Long Face Syndrome]] or other malocclusions<ref>R.M. Rubin, Mode of respiration and facial growth,it can also cause bloody gums. Am. J. Orthod. 78 (1980), pp. 504–510. [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B7G77-4BV47C4-3&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1061307984&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=4021c42f8e8a73cc271b9ae346d0b27b]</ref>.

==Dental effect ==
Mouth breathing is considered harmful to the dento-oral complex as it can lead to [[hypotonicity]] of the upper [[lip]], hyperactivity of the lower lip, distoclusion, harm to dental growth as well as bone growth, high vault of the [[palate]], [[xerostomia]], and adenoid face{{Fact|date=April 2010}}.

==Social perception==
In North America, mouth breathing in public is sometimes considered to be less socially acceptable or attractive than nose breathing, as mouth breathers can appear to have a somewhat "[[w:slack jawed|slack jawed]]" look, and mouth breathing can cause or exacerbate [[halitosis|bad breath]]{{Fact|reason=see talk page|date=October 2009}}.  Thus the term 'mouth breather' is used as an insult towards a person with a perceived lack of intelligence or someone with poor social skills.  This pejorative term should not be confused with the medical description of mouth breathing - indeed, it is used as a general form of insult, and not necessarily to refer to people who breathe through the mouth.  This term is widespread as a pejorative in America, but is rarely used in other parts of the world. 

==See also==
* [[Sleep apnea]]
* [[Snoring]]

==References==
{{Reflist}}

{{Circulatory and respiratory system symptoms and signs}}

[[Category:Symptoms and signs: Circulatory and respiratory systems]]


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[[fr:Respiration orale]]
[[nl:Mondademhaling]]
[[pt:Respiração pela boca]]
[[Category:2Fix]]