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Feb 02, 2026

Doctors Warn About the Harmful Effects of Mouth Breathing

Mouth breathing may seem harmless, but it can lead to sleep disorders, gum disease, sore throat, and many other serious health issues.


Breathing is a continuous and almost unconscious activity, yet the way we breathe has a significant impact on our overall health.

According to ENT (Ear, Nose, and Throat) specialists, prolonged mouth breathing is not just a bad habit—it can pose serious health risks, ranging from sleep disturbances and oral health problems to respiratory issues.

Dr. Harihara Murthy, an ENT specialist and head and neck surgeon at Apollo Spectra Hospital in Bangalore, India, explains that nasal breathing is the body’s natural mechanism.


When air passes through the nose, it is warmed, humidified, and filtered before reaching the lungs. In contrast, mouth breathing bypasses this “protective barrier,” making the body more vulnerable to harm.


Common Health Risks


According to Dr. Murthy, sleep disorders are among the most common consequences of mouth breathing. This habit can cause enlarged tonsils and persistent snoring, leading to disrupted sleep and reduced recovery of energy.

Oral health problems are also frequent. Mouth breathing dries out the oral cavity, disrupts the natural balance of bacteria, and increases the risk of gum disease, tooth decay, and chronic bad breath.

In terms of respiratory health, oxygen levels in the blood may decrease, negatively affecting lung function. This is particularly dangerous for individuals with asthma or chronic lung conditions, as it can worsen their symptoms.

A less commonly recognized effect is drooping eyelids and dark circles under the eyes. According to doctors, mouth breathing can cause veins around the eyes to dilate over time, resulting in a tired and less vibrant appearance.


Additionally, people who breathe through their mouths are more prone to colds, sinus infections, and allergies. Without nasal filtration, bacteria and allergens can enter directly into the throat. Chronic sore throat—especially in the morning—is also common due to prolonged dryness of the throat lining.


Special Risks for Children


Dr. Murthy warns that mouth breathing in children can have long-term effects on facial and dental development.


Children may develop misaligned teeth, abnormal jaw growth, longer facial structure, protruding upper lips, and wider nostrils.

These changes not only affect appearance but can also impact breathing and chewing functions.


When Should You See a Doctor?

Mouth breathing during a cold or temporary nasal congestion is normal. However, if the condition persists, medical evaluation is necessary to identify underlying causes.


Warning signs include:

  • Frequent dry mouth

  • Mental fatigue

  • Continuous snoring

  • Drooling during sleep

  • Waking up feeling tired or irritable

How to Prevent Mouth Breathing

To reduce mouth breathing, Dr. Murthy recommends practicing diaphragmatic breathing, which helps the body return to natural nasal breathing.

In addition, individuals with sleep apnea or poor sleep quality should pay attention to proper sleeping posture, use supportive pillows, and seek early treatment for nasal and throat conditions.


According to experts, recognizing and correcting breathing habits early is a simple yet crucial step in protecting long-term health.


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