Why do some people breathe through their mouths?

by · KalingaTV

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Several conditions can make nasal breathing difficult, forcing people to rely more heavily on their mouths.

Common causes include:

  • Nasal congestion: Colds, allergies, and sinus infections can block the nasal passages.
  • Deviated nasal septum: A displaced wall between the nostrils can restrict airflow.
  • Enlarged tonsils or adenoids: Particularly common causes of mouth breathing in children.
  • Nasal polyps: These growths can obstruct the nasal passages.
  • Sleep apnoea: A sleep-related breathing disorder that can cause repeated interruptions in breathing.
  • In some cases, mouth breathing can also become a habitual pattern.

Five effects of habitual mouth breathing you should know

  1. Dry mouth and cracked lips

Breathing through the mouth allows moisture to evaporate more quickly. This can leave the mouth and throat dry, particularly after a night’s sleep.

  1. Bad breath

Saliva helps wash away food particles and control bacteria inside the mouth. Reduced moisture can contribute to unpleasant breath.

  1. Increased risk of dental problems

Persistent dry mouth can increase the risk of tooth decay, gum irritation and other oral health problems because saliva helps protect teeth and gums.

  1. Disturbed sleep and daytime fatigue

Mouth breathing may occur alongside snoring or obstructive sleep apnoea. When breathing difficulties repeatedly interrupt sleep, a person may wake up feeling tired and struggle with concentration during the day.

5. Changes in facial and dental development in children

Long-term mouth breathing during childhood, particularly when associated with airway obstruction, may be linked to changes in jaw development, facial structure and tooth alignment. This is one reason persistent mouth breathing in children should be evaluated early.

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  1. How can you recognise if you are a mouth breather?

Many people do not realise they breathe through their mouths, particularly when sleeping.

However, certain recurring signs may offer clues:

  • Frequently waking up with a dry mouth.
  • Regular morning sore throat.
  • Snoring or noisy breathing during sleep.
  • Drooling on the pillow.
  • Persistent bad breath despite maintaining oral hygiene.
  • Feeling unusually tired after a full night’s sleep.
  • Frequently experiencing nasal blockage.

These symptoms do not confirm mouth breathing or sleep apnoea on their own, but recurring problems deserve medical attention

Simple ways to address the problem

The first step is to identify why someone is breathing through their mouth rather than simply trying to force the mouth to remain closed.

Address nasal congestion: Consult a healthcare professional about persistent allergies or blocked nasal passages.

  • Stay hydrated: Drink adequate water throughout the day to help manage dry mouth.
  • Maintain oral hygiene: Brush twice daily and maintain regular dental check-ups.
  • Keep your sleeping environment comfortable: If dry air worsens nasal irritation, an appropriately maintained humidifier may help.
  • Seek an ENT evaluation: Persistent nasal obstruction may require examination by an ear, nose and throat specialist.
  • Check for sleep disorders: Loud snoring, gasping, or pauses in breathing during sleep should be medically evaluated.
  • An important precaution: Mouth taping has become popular on social media as a way to encourage nasal breathing during sleep. However, it is not a proven treatment and can be dangerous for people with nasal obstruction or sleep-related breathing disorders. Do not tape your mouth shut without medical advice.

 When should you consult a doctor?

Occasional mouth breathing during a cold or exercise is generally not a concern. However, persistent mouth breathing, particularly when accompanied by loud snoring, frequent waking, daytime sleepiness or difficulty breathing through the nose, should not be ignored.

A doctor may examine the nasal passages and throat and, if necessary, recommend an ENT consultation or a sleep study to identify conditions such as obstructive sleep apnoea.

Breathing is something we do automatically, which is why we rarely pay attention to how we breathe. But persistent mouth breathing can sometimes be the body’s way of indicating that normal nasal airflow is restricted.

A dry mouth in the morning may seem like a minor inconvenience, but when it repeatedly occurs alongside snoring, fatigue or nasal blockage, it deserves attention. Understanding the underlying cause and seeking appropriate treatment can help protect both sleep quality and oral health.

Also Read: Scientists discover a hidden reason why muscles weaken with age: Study

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