Also known as: breathing through the mouth, open-mouth breathing, sleeping with mouth open, chronic mouth breathing, oral breathing, difficulty breathing through the nose

Mouth breathing in children means regularly breathing through the mouth instead of comfortably through the nose. Parents may notice their child keeping their lips apart during the day, sleeping with their mouth open, waking with a dry mouth, or breathing noisily at night. Occasional mouth breathing during a cold is common, but a pattern that continues when your child is otherwise healthy deserves a closer look.

Persistent mouth breathing can have several causes, including nasal congestion, allergies, enlarged tonsils or adenoids, or differences in oral and facial development. In some children, a narrow upper jaw may occur alongside mouth breathing and limited nasal airflow. Because the cause can be dental, orthodontic, medical, or a combination of factors, evaluation helps determine what type of care is appropriate.

Possible Causes of Mouth Breathing

Mouth breathing may be associated with:

  • Nasal congestion or allergies – A blocked or irritated nose can make nasal breathing difficult and cause a child to rely more heavily on the mouth.
  • Enlarged tonsils or adenoids – Enlarged tissues in the upper airway can restrict airflow and contribute to open-mouth breathing, especially during sleep.
  • A narrow upper jaw – Some children with maxillary constriction also have reduced nasal dimensions or difficulty breathing comfortably through the nose.
  • Oral posture and breathing habits – After a period of congestion or obstruction, some children may continue holding the mouth open even when nasal breathing becomes easier.

Treatments for Mouth Breathing

Depending on what is contributing to mouth breathing, treatment may include:

  • Airway Orthodontics – When mouth breathing occurs alongside a narrow upper jaw, palatal expansion may widen the upper arch and nasal floor while addressing the child’s orthodontic needs.
  • Exams & Cleanings – Routine dental visits can identify dry mouth, crowding, bite changes, and other oral signs that may help determine whether orthodontic or medical evaluation is appropriate.

Airway orthodontics does not treat allergies, enlarged tonsils or adenoids, or every cause of mouth breathing. Medical referral may be recommended when symptoms suggest another source of nasal obstruction.

When to See a Dentist or Medical Provider

Consider scheduling an evaluation if your child:

  • Breathes through the mouth regularly during the day or while sleeping
  • Struggles to breathe comfortably through the nose
  • Snores frequently or has noisy breathing during sleep
  • Has mouth breathing along with crowding, a crossbite, or a noticeably narrow upper arch
  • Has pauses in breathing, gasping, or other concerning sleep symptoms

Persistent snoring, pauses in breathing, or suspected sleep apnea should be evaluated by an appropriate medical provider.

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Mouth breathing can have several possible causes, and the right treatment depends on what is contributing to the problem. We’d love to evaluate your child’s symptoms and help determine whether orthodontic care or additional medical evaluation may be helpful. Schedule an appointment today and get the answers you need.