Mouth Breathing

  • Could mouth breathing be affecting your child’s speech, sleep and development?

    ByLondon Speech and Feeding
    Could mouth breathing be affecting your child's speech, sleep and development?

    Understanding Orofacial Myofunctional Disorders (OMDs)

    Many parents contact me at London Speech and Feeding because they are worried about their child’s speech. Perhaps their child is difficult to understand, has a persistent lisp, struggles with feeding, snores at night, or always seems to have their mouth open.

    What many families don’t realise is that these concerns may all be connected.

    Increasingly, research and clinical experience are highlighting the important role of Orofacial Myofunctional Health, the way the muscles of the face, mouth, tongue and airway work together to support breathing, eating, sleeping and communication.

    When these muscles are not functioning optimally, children may develop what are known as Orofacial Myofunctional Disorders (OMDs).

    What Is Orofacial Myofunctional Health?

    Orofacial Myofunctional Health refers to the healthy function and coordination of the:

    • lips
    • tongue
    • jaw
    • cheeks
    • facial muscles
    • airway.

    These structures play a vital role in:

    • breathing
    • swallowing
    • chewing
    • speaking
    • facial growth
    • dental development
    • sleep quality.

    When everything is working well, the lips remain gently closed at rest, breathing occurs through the nose, and the tongue rests against the roof of the mouth.

    This seemingly simple posture has a profound influence on how a child’s face, teeth and airway develop.

    What is an Orofacial Myofunctional Disorder?

    An Orofacial Myofunctional Disorder occurs when there is an abnormal pattern of muscle function involving the face, mouth, tongue or airway.

    Children with OMDs may experience difficulties with:

    • speech
    • feeding
    • swallowing
    • sleep
    • breathing
    • dental development
    • facial growth.

    In many cases, these difficulties are linked to chronic mouth breathing.

    Signs your child may have an Orofacial Myofunctional Disorder

    Breathing and sleep signs

    • mouth open at rest
    • mouth breathing during the day
    • snoring
    • noisy breathing
    • restless sleep
    • frequent waking
    • dark circles under the eyes
    • chronic congestion
    • fatigue despite a full night’s sleep.

    Speech signs

    • lisping
    • unclear speech
    • distorted speech sounds
    • difficulty producing certain sounds
    • persistent articulation difficulties
    • reduced speech intelligibility.

    Feeding and swallowing signs

    • picky eating
    • messy eating
    • food remaining in the cheeks
    • gagging easily
    • difficulty chewing
    • long mealtimes
    • tongue thrust swallowing.

    Facial and dental signs

    • narrow palate
    • crowded teeth
    • open bite
    • overbite
    • underbite
    • long face appearance
    • receding chin
    • poor lip seal.

    If several of these signs sound familiar, a comprehensive assessment may be worthwhile.

    Why does mouth breathing matter?

    Many parents assume mouth breathing is simply a habit.

    In reality, mouth breathing is often a symptom that something is preventing efficient nasal breathing.

    Common causes include:

    • enlarged tonsils
    • enlarged adenoids
    • allergies
    • chronic nasal congestion
    • recurrent infections
    • structural airway differences
    • tongue tie
    • prolonged dummy use
    • thumb sucking
    • poor oral posture.

    When nasal breathing becomes difficult, children naturally begin breathing through their mouths.

    Over time, this can affect how the face, jaws and airway develop.

    What does healthy oral posture look like?

    Healthy oral posture is surprisingly simple:

    • lips
      • gently closed
    • tongue
      • resting against the roof of the mouth
    • teeth
      • slightly apart
    • breathing
      • through the nose.

    This posture helps guide healthy jaw growth, facial development and airway formation.

    Think of the tongue as a natural orthodontic support system. When it rests in the correct position, it helps shape the upper jaw and supports healthy facial growth.

    The consequences of chronic mouth breathing

    1. Speech difficulties

    Children who breathe through their mouths often have altered tongue posture and reduced oral stability.

    This can contribute to:

    • lisping
    • distorted sounds
    • reduced speech clarity
    • difficulty learning new speech sounds.

    2. Feeding and swallowing difficulties

    A low tongue posture may affect:

    • chewing efficiency
    • swallowing patterns
    • food management
    • oral motor coordination.

    Many children develop a tongue thrust swallow, where the tongue pushes forward instead of moving efficiently during swallowing.

    3. Poor sleep quality

    Mouth breathing can contribute to:

    • snoring
    • restless sleep
    • frequent waking
    • daytime fatigue
    • reduced concentration.

    Poor sleep can have a significant impact on learning, behaviour and emotional regulation.

    4. Changes to facial growth

    Over time, chronic mouth breathing may influence:

    • jaw development
    • facial proportions
    • dental alignment
    • airway size.

    This can result in:

    • narrow palates
    • crowded teeth
    • long facial appearance
    • increased orthodontic needs.

    5. Oral health concerns

    The nose acts as a natural filter and humidifier.

    When children breathe through their mouths:

    • The mouth becomes dry.
    • Saliva protection is reduced.
    • Risk of tooth decay increases.
    • Gum health may be affected.

    Why this matters for speech therapy

    Speech does not develop in isolation.

    The tongue, lips, jaw and airway work together to support clear communication.

    At London Speech and Feeding, we look beyond speech sounds alone.

    A child who presents with:

    • persistent speech difficulties
    • lisping
    • feeding challenges
    • open mouth posture
    • snoring
    • poor sleep

    may benefit from an assessment that explores underlying orofacial myofunctional factors.

    Addressing these foundations can often support more effective progress in speech and feeding therapy.

    How London Speech and Feeding can help

    A comprehensive assessment may include observation of:

    • breathing patterns
    • lip posture
    • tongue posture
    • swallowing function
    • feeding skills
    • speech sound development
    • sleep concerns
    • oral structures.

    Where appropriate, recommendations may include:

    • orofacial myofunctional therapy
    • speech therapy
    • feeding therapy
    • home programmes
    • ENT referral
    • orthodontic referral
    • collaborative multidisciplinary support.

    The good news

    Orofacial Myofunctional Disorders are often highly treatable when identified early.

    Supporting healthy breathing, tongue posture and oral muscle function can positively influence:

    If your child regularly breathes through their mouth, snores, struggles with speech clarity or has feeding difficulties, a specialist assessment may help identify the underlying cause.

    • speech clarity
    • feeding skills
    • sleep quality
    • facial growth
    • dental development
    • overall wellbeing.

    At London Speech and Feeding, we are passionate about looking beyond symptoms and understanding the whole child. Contact me!

    Sometimes the key to clearer speech starts with a simple question:

    ‘Is my child breathing through their nose?’

    Sonja McGeachie

    Highly Specialist Speech and Language Therapist

    Owner of The London Speech and Feeding Practice.

    Frequently Asked Questions

    Can mouth breathing cause speech problems?

    Yes. Mouth breathing can alter tongue posture, lip strength and oral stability, which may contribute to articulation difficulties and lisps.

    Should I be worried if my child snores?

    Regular snoring is not considered normal in children and may indicate airway obstruction or sleep-disordered breathing.

    Can enlarged tonsils affect speech?

    Yes. Enlarged tonsils may affect resonance, tongue positioning, swallowing and breathing patterns.

    What age can children be assessed?

    Children of all ages can be assessed if parents have concerns about speech, feeding, breathing or oral development.

    What is Orofacial Myofunctional Therapy?

    Orofacial Myofunctional Therapy focuses on improving breathing patterns, tongue posture, lip seal and oral muscle function to support overall health and development.

    Health Professions Council registered
    Royal College of Speech & Language Therapists Member
    Member of ASLTIP

    Find a speech and language therapist for your child in London. Are you concerned about your child’s speech, feeding or communication skills and don’t know where to turn? Please contact me and we can discuss how I can help you or visit my services page.

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  • · ·

    The hidden impact of mouth breathing and open mouth posture on speech and feeding

    ByLondon Speech and Feeding

    When most people think about speech or feeding difficulties, they picture the tongue, lips, or chewing skills, but how a child breathes at rest plays a surprisingly big role too.

    Mouth breathing and open mouth resting posture can quietly influence everything from how a child’s face grows to how clearly they speak, to how confidently they chew and swallow. It’s something many parents never think about, until they start noticing the subtle signs.

    Let’s explore why this happens, what to look for, and how to gently support better breathing and oral posture.

    Recent research supports this link between mouth breathing and speech difficulties. For example, a 2022 study by Alhazmi et al., published in the Journal of Pharmacy and Bioallied Sciences, found that 81.7% of children aged 9–17 who breathed primarily through their mouths presented with speech sound disorders. The study highlights how mouth breathing can significantly influence orofacial development and articulation patterns.

    💨 Why we’re designed to breathe through our nose

    Our bodies are made for nasal breathing. When we breathe through the nose, the air is filtered, warmed, and humidified before reaching the lungs. The tongue naturally rests against the roof of the mouth, the lips close gently, and the jaw stays relaxed, all of which encourage healthy oral development.

    In contrast, mouth breathing often means the tongue rests low in the mouth and the lips stay apart. Over time, this posture can subtly reshape how the muscles and bones of the face grow.

    Children who breathe through their mouths most of the time may develop:

    • A longer face and narrower palate
    • Forward head posture
    • Slightly open lips and low tongue position at rest
    • A tendency toward drooling or noisy breathing
    • A dry mouth and consequently bad breath
    • At times the tongue pushes constantly against the front teeth causing them to grow forward (buck teeth)

    These changes are not anyone’s fault, as they often start because of blocked noses, allergies, enlarged adenoids, low facial muscle tone or habits formed when a child was younger. But understanding the pattern helps us know how to support change.

    🗣 How mouth breathing affects speech

    Speech depends on precise coordination between the lips, tongue, and jaw. The resting position of these structures affects how ready they are to move.

    1. Reduced tongue strength and placement, i.e. the tongue rests low in the mouth (as it does in mouth breathing), it’s harder for children to lift it efficiently for sounds like /T/, /D/, /N/, /L/, and /S/. This can lead to speech that sounds slightly slushy or unclear, or a frontal lisp.
    2. Open mouth posture and resonance: An open mouth at rest may affect how air vibrates in the oral and nasal cavities. Children might have speech that sounds a bit ‘muffled’ or lacks crispness because the lips and jaw aren’t fully supporting articulation.
    3. Fatigue and breath control: Mouth breathing can lead to drier mouths and less efficient breath support. That can make longer sentences or conversations feel tiring, especially in noisy environments.

    🥄 How mouth breathing affects feeding and chewing

    Feeding involves the same structures that control speech, so posture and breathing patterns matter here, too.

    1. Chewing efficiency: Children who habitually keep their mouths open often have low tongue tone and reduced jaw stability. They may prefer softer foods, chew slowly, or struggle with mixed textures.
    2. Swallowing pattern: A tongue that rests low may push forward when swallowing. This ‘tongue-thrust swallow’ can interfere with efficient chewing and even affect dental alignment over time.
    3. Breathing while eating: Since it’s hard to chew, swallow, and breathe through the mouth simultaneously, children who can’t comfortably nasal breathe may rush bites or pause to catch their breath. This can contribute to coughing, choking, or food refusal.

    Common signs to watch for

    Parents often notice subtle clues before realising mouth breathing is a pattern. Some red flags include:

    • Lips habitually open at rest
    • Drooling after the toddler years
    • Snoring or noisy breathing during sleep
    • Preference for soft foods or grazing eating habits
    • Dark circles under the eyes due to allergies
    • Frequent colds, congestion, or mouth odour
    • Speech that sounds slushy or unclear despite good effort

    If several of these sound familiar, it’s worth mentioning them to your child’s GP, dentist, or speech and language therapist.

    👩‍⚕️ What can help

    1. Address the underlying cause: If nasal blockage, allergies, or enlarged adenoids are making nasal breathing difficult, a medical assessment is the first step. ENT specialists can rule out or treat physical causes.
    2. Encourage closed mouth rest: Gentle reminders like ‘Lips together, tongue up, breathe through your nose’ can help older children become aware of their resting posture. For younger ones, visual cues (stickers or mirrors) can make it a game.
    3. Build oral-motor strength and awareness: Speech therapists can design activities to strengthen the tongue and lips, improve jaw stability, and encourage balanced breathing. This might include blowing games, tongue-tip lifts, use of dental-palatal devices or oral-motor exercises disguised as play.
    4. Support good posture: Sometimes mouth breathing goes hand-in-hand with forward-head posture. Encouraging upright sitting during meals and screen time helps keep the airway open and supports better breathing habits.
    5. Make nasal breathing part of daily routines: Gentle nose-breathing practice during calm times (reading, bedtime, car rides) helps normalise it. Avoid making it a battle: calm, consistent reminders work best.

    🌱 A gentle note on change

    Patterns of mouth breathing develop over time, and change doesn’t happen overnight. It’s important to approach this with curiosity, not criticism. The aim isn’t ‘perfect breathing,’ but to give your child the tools and awareness to breathe comfortably and efficiently.

    Small improvements in nasal breathing and resting posture can lead to big gains in speech clarity, eating confidence, and even sleep quality.

    💡 The takeaway

    Breathing seems automatic, and it is! but how we breathe matters. Mouth breathing and open-mouth posture can quietly shape how a child speaks, eats, and grows.

    By noticing early signs, addressing underlying causes, and building supportive habits, you can help your child move toward stronger, clearer speech and more comfortable mealtimes.

    Just like every area of development, progress starts with connection, patience, and gentle consistency, one calm breath at a time.

    Sonja McGeachie

    Highly Specialist Speech and Language Therapist

    Owner of The London Speech and Feeding Practice.

    References

    Alhazmi, A., Alshamrani, A., Alhussain, A., et al. (2022). Mouth Breathing and Speech Disorders: A Multidisciplinary Study. Journal of Pharmacy and Bioallied Sciences 14(5):911. https://www.researchgate.net/publication/361978128_Mouth_breathing_and_speech_disorders_A_multidisciplinary_evaluation_based_on_the_etiology

    Health Professions Council registered
    Royal College of Speech & Language Therapists Member
    Member of ASLTIP

    Find a speech and language therapist for your child in London. Are you concerned about your child’s speech, feeding or communication skills and don’t know where to turn? Please contact me and we can discuss how I can help you or visit my services page.

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