Atypical swallowing, also known as tongue thrust swallowing, is characterized by an altered relationship between the tongue, teeth, lips, and surrounding musculature during deglutition.
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This pattern may be associated with anterior open bite, increased overjet, altered incisor inclination, and instability during orthodontic treatment.
However, the relationship is not always strictly causal: an existing malocclusion may also promote an adaptive tongue posture. Current evidence therefore supports an individualized and often multidisciplinary approach rather than treating tongue thrust as an isolated habit.
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During a mature swallowing pattern, the tongue generally assumes a relatively elevated and posterior position, with coordinated activity of the lips, cheeks, tongue, and masticatory muscles.
In atypical swallowing, the tongue may protrude anteriorly, interpose between the incisors, or exert abnormal pressure during swallowing.
Clinically, the orthodontist may observe:
▪️ Anterior tongue thrust
▪️ Anterior open bite
▪️ Increased overjet or proclination of incisors
▪️ Lip incompetence or excessive perioral muscle activity
▪️ Altered tongue resting posture
▪️ Associated oral habits such as prolonged digit sucking
The clinical examination should also investigate potential contributing factors, including mouth breathing, nasal obstruction, enlarged adenoids or tonsils, and persistent oral habits. A 2024 systematic review and meta-analysis found an association between mouth breathing and atypical swallowing, reinforcing the importance of evaluating airway-related factors rather than focusing exclusively on the tongue.
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Treatment should address both the functional pattern and the occlusal consequences.
1. Identify and manage contributing factors
Persistent oral habits and airway problems should be identified before or during orthodontic treatment. If nasal obstruction or another airway-related problem is suspected, appropriate medical evaluation is indicated.
2. Orofacial myofunctional therapy
Orofacial myofunctional therapy (OMT) aims to establish more appropriate tongue posture, lip function, and neuromuscular coordination.
Evidence suggests that OMT can improve aspects of tongue strength and orofacial motor function in patients with tongue thrust. However, the strength of evidence remains limited. A 2025 scoping review found that although many studies reported positive outcomes, the available evidence was heterogeneous and insufficient to definitively confirm OMT effectiveness across orofacial myofunctional disorders.
Therefore, OMT is best considered an adjunctive functional intervention, particularly when persistent tongue dysfunction may compromise orthodontic stability.
3. Orthodontic correction
When atypical swallowing is associated with an anterior open bite, orthodontic treatment may be required to correct the resulting dentoalveolar discrepancy.
The appliance selection depends on the patient's age, dentition, skeletal pattern, severity of the open bite, oral habits, and functional findings.
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A lingual crib, also called a palatal crib or tongue crib, is an orthodontic habit-breaking appliance designed to limit anterior tongue interposition.
Its primary functions are to:
▪️ Prevent the tongue from advancing between the incisors
▪️ Reduce the mechanical influence of anterior tongue thrust
▪️ Provide a physical barrier during swallowing
▪️ Encourage a more favorable tongue posture
▪️ Assist correction of anterior open bite associated with tongue thrust or other oral habits
The appliance does not simply "push the tongue backward." Its principal effect is to prevent the tongue from occupying the anterior interdental space, allowing the dentoalveolar structures to respond to the altered functional environment.
Experimental evidence has demonstrated adaptation of tongue pressure and resting behavior during crib therapy, suggesting that the tongue can progressively adapt to the new intraoral environment.
🔹 Lingual Crib: Fixed vs. Removable
| Appliance | Main Advantage | Clinical Consideration |
|---|---|---|
| Fixed lingual crib | Continuous restriction of anterior tongue interposition | Less dependent on patient compliance |
| Removable lingual crib | Easier hygiene and removal | Effectiveness depends strongly on patient adherence |
| Palatal crib with other appliances | Can simultaneously address open bite or transverse problems | Treatment should be individualized according to the malocclusion |
A 2022 systematic review and meta-analysis found that fixed palatal cribs, removable palatal cribs, and bonded lingual spurs produced broadly comparable overbite changes in early anterior open-bite treatment, although the quality of evidence was low.
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A lingual crib may be particularly useful when there is:
▪️ Anterior open bite associated with tongue thrust
▪️ Persistent anterior tongue interposition
▪️ A need for continuous habit control
▪️ A functional component contributing to orthodontic instability
▪️ A mixed-dentition patient in whom early interception is appropriate
The appliance should not be prescribed solely because an anterior open bite is present. The clinician should establish whether tongue posture or thrusting is clinically relevant to the malocclusion.
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The management of atypical swallowing requires distinguishing between a functional disorder and its dental manifestations. A lingual crib can be highly useful for mechanically controlling anterior tongue interposition, but it should not be regarded as a complete treatment for the underlying neuromuscular pattern.
Evidence from clinical trials indicates that palatal crib therapy can produce meaningful improvement in anterior open bite, while long-term studies suggest favorable stability in selected growing patients. Nevertheless, treatment outcomes depend on the etiology, skeletal growth pattern, severity of the malocclusion, and persistence of the underlying functional factors.
Similarly, current evidence does not justify assuming that every patient with tongue thrust requires prolonged myofunctional therapy. OMT may provide functional benefits, but methodological limitations and heterogeneous treatment protocols remain important limitations in the literature.
Consequently, the most rational approach is etiologic diagnosis + orthodontic correction when indicated + functional rehabilitation when clinically necessary.
🎯 Clinical Recommendations
1. Do not diagnose atypical swallowing from an anterior open bite alone. Confirm tongue posture and swallowing behavior clinically.
2. Evaluate airway obstruction, mouth breathing, digit sucking, and other oral habits when relevant.
3. Consider a lingual crib when anterior tongue interposition is demonstrably contributing to the malocclusion.
4. Use orofacial myofunctional therapy selectively, particularly when abnormal tongue posture or muscular coordination persists.
5. During orthodontic treatment, monitor the functional pattern as well as overbite and overjet to reduce the risk of persistent dysfunction and relapse.
6. In complex cases, coordinate care between orthodontics, speech-language pathology/myofunctional therapy, and medical specialists when airway or other contributing factors are identified.
✍️ Conclusion
Atypical swallowing should be managed as a functional and orthodontic problem rather than as an isolated habit. The lingual crib is useful because it mechanically restricts anterior tongue interposition and can facilitate correction of associated anterior open bite. However, successful long-term management requires identification of contributing factors and, when indicated, functional rehabilitation.
Current evidence supports the lingual crib as a useful orthodontic adjunct, while the evidence for orofacial myofunctional therapy remains promising but insufficiently standardized. A patient-specific, multidisciplinary strategy therefore provides the most defensible clinical approach.
📚 References
✔ Gómez-González, C., González-Mosquera, A., Alkhraisat, M. H., & Anitua, E. (2024). Mouth breathing and its impact on atypical swallowing: A systematic review and meta-analysis. Dentistry Journal, 12(2), 21. https://doi.org/10.3390/dj12020021
✔ Homem, M. A., Vieira-Andrade, R. G., Falci, S. G. M., Ramos-Jorge, M. L., & Marques, L. S. (2014). Effectiveness of orofacial myofunctional therapy in orthodontic patients: A systematic review. Dental Press Journal of Orthodontics, 19(4), 94–99. https://doi.org/10.1590/2176-9451.19.4.094-099.oar
✔ Mousa, M. R., Hajeer, M. Y., & Farah, H. (2021). Evaluation of the open-bite Bionator versus the removable posterior bite plane with a tongue crib in the early treatment of skeletal anterior open bite: A randomized controlled trial. European Journal of Orthodontics, 43(4), 163–171. https://doi.org/10.1016/j.ejwf.2021.08.001
✔ Shortland, H.-A. L., Hewat, S., Vertigan, A., & Webb, G. (2021). Orofacial myofunctional therapy and myofunctional devices used in speech pathology treatment: A systematic quantitative review of the literature. American Journal of Speech-Language Pathology, 30(1), 301–317. https://doi.org/10.1044/2020_AJSLP-20-00245
✔ Stefani, C. M., de Almeida de Lima, A., Stefani, F. M., Kung, J. Y., Flores-Mir, C., & Compton, S. M. (2025). Effectiveness of orofacial myofunctional therapy in improving orofacial function and oral habits: A scoping review. Canadian Journal of Dental Hygiene, 59(1), 59–72.
✔ Taslan, S., Biren, S., & Ceylanoglu, C. (2010). Tongue pressure changes before, during and after crib appliance therapy. The Angle Orthodontist, 80(3), 533–539. https://doi.org/10.2319/070209-370.1
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