Premolar extraction in orthodontic treatment remains one of the most debated topics in contemporary orthodontics. While extraction-based treatment was historically common for managing crowding and dentoalveolar protrusion, modern biomechanical approaches have increased the feasibility of non-extraction alternatives.
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✅ Introduction
The decision to extract premolars during orthodontic treatment has evolved significantly over the past decades. Historically, extractions were frequently recommended to create space, improve dental alignment, and optimize facial esthetics. More recently, advances in orthodontic technology, including skeletal anchorage systems, transverse expansion protocols, interproximal enamel reduction, and aligner therapy, have enabled clinicians to treat many patients without removing teeth.
Despite these developments, a growing narrative on social media and some clinical forums suggests that premolar extractions are harmful and should be avoided in all cases. Such claims often cite concerns regarding facial flattening, temporomandibular disorders, airway compromise, and obstructive sleep apnea. The scientific validity of these assertions requires careful examination.
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Premolar extractions became widely accepted following the work of orthodontists such as Charles Tweed, who demonstrated improved stability and facial outcomes in selected cases with severe crowding or protrusion.
For decades, extraction therapy represented a standard treatment option. However, concerns emerged regarding excessive incisor retraction and potential adverse facial changes when extractions were performed indiscriminately.
This historical overuse contributed to the development of a strong non-extraction philosophy among some clinicians.
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The notion that premolar extraction is inherently harmful is largely considered a clinical myth rather than an evidence-based conclusion.
Modern orthodontics recognizes that neither extraction nor non-extraction therapy is universally superior. Instead, treatment decisions should be individualized according to:
▪️ Skeletal pattern
▪️ Facial profile
▪️ Degree of crowding
▪️ Incisor inclination
▪️ Periodontal status
▪️ Airway considerations
▪️ Long-term stability goals
Current evidence indicates that premolar extractions remain a scientifically supported treatment option when properly indicated.
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Concerns About Facial Esthetics
One of the primary arguments against extractions is the possibility of excessive retraction of anterior teeth, potentially resulting in:
▪️ Reduced lip prominence
▪️ Flattening of the facial profile
▪️ Less favorable soft-tissue esthetics
However, these effects are primarily associated with inappropriate case selection rather than extraction therapy itself.
In patients with significant dentoalveolar protrusion, premolar extractions often improve facial harmony and lip competence.
Concerns About Temporomandibular Disorders
A common misconception is that premolar extraction treatment causes temporomandibular disorders (TMD).
Systematic reviews and longitudinal studies have consistently found no significant association between orthodontic extractions and the development of TMD.
Current evidence suggests that orthodontic treatment, whether extraction-based or non-extraction, does not increase the risk of temporomandibular dysfunction.
Concerns About Airway Dimensions and Sleep Apnea
Another controversial claim is that premolar extractions reduce airway volume and increase the risk of obstructive sleep apnea (OSA).
Several imaging studies have evaluated changes in airway dimensions following orthodontic treatment. While minor anatomical alterations may occur in some patients, current systematic reviews have not demonstrated a causal relationship between premolar extractions and OSA development.
The available evidence remains insufficient to support the claim that extraction therapy causes sleep-disordered breathing in otherwise healthy individuals.
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Modern orthodontic literature supports several important conclusions:
Extraction Therapy Is Still Indicated in Specific Cases
Premolar extraction may be beneficial in:
▪️ Severe dental crowding
▪️ Significant bimaxillary protrusion
▪️ Lip incompetence
▪️ Excessive incisor proclination
▪️ Cases requiring facial profile improvement
▪️ Situations where expansion or distalization would compromise periodontal health
Non-Extraction Alternatives Have Expanded
Advances in orthodontics now allow clinicians to manage many cases without extractions through:
▪️ Temporary anchorage devices (TADs)
▪️ Maxillary expansion techniques
▪️ Interproximal enamel reduction
▪️ Molar distalization
▪️ Growth modification protocols
▪️ Clear aligner biomechanics
These alternatives reduce the frequency of extractions but do not eliminate their clinical relevance.
Long-Term Stability Depends on Diagnosis
Research demonstrates that relapse can occur in both extraction and non-extraction treatments.
Long-term stability depends more on proper diagnosis, treatment planning, retention protocols, and patient compliance than on extraction decisions alone.
📊 Summary Table: Indications for Premolar Extraction in Orthodontic Treatment
| Clinical Situation | Potential Benefits of Extraction | Considerations Before Extraction |
|---|---|---|
| Severe Dental Crowding | Creates adequate space for alignment without excessive expansion or proclination. | Assess whether skeletal expansion, distalization, or IPR can provide sufficient space. |
| Significant Bimaxillary Protrusion | Allows controlled retraction of incisors and improvement of lip competence. | Requires careful soft-tissue analysis to avoid excessive profile flattening. |
| Excessive Incisor Proclination | Facilitates correction of incisor inclination within alveolar limits. | Evaluate periodontal support and alveolar bone dimensions. |
| Lip Incompetence | May improve facial balance and reduce lip strain at rest. | Soft-tissue response varies among individuals. |
| Periodontal Limitations | Reduces the need for expansion beyond biological limits. | Comprehensive periodontal assessment is essential. |
| Borderline Skeletal Cases | Can improve occlusal relationships without surgical intervention in selected patients. | Must be evaluated alongside facial esthetics and growth potential. |
| Mild to Moderate Crowding | Usually not the first-line indication for extraction. | Consider expansion, distalization, aligner mechanics, or IPR first. |
The controversy surrounding premolar extractions often stems from historical treatment practices in which extractions were performed routinely rather than selectively. Contemporary orthodontics has moved away from this approach and emphasizes individualized diagnosis.
Current scientific evidence does not support blanket statements such as "premolar extractions should never be performed". Similarly, routine extraction of premolars without comprehensive diagnosis is equally unsupported.
The modern paradigm favors evidence-based treatment planning, balancing facial esthetics, occlusal function, periodontal health, and long-term stability.
🎯 Recommendations
▪️ Perform a comprehensive skeletal, dental, and soft-tissue evaluation before deciding on extractions.
▪️ Consider non-extraction alternatives whenever clinically appropriate.
▪️ Avoid extraction decisions based solely on crowding measurements.
▪️ Evaluate facial profile and periodontal limitations carefully.
▪️ Inform patients about the benefits and limitations of both extraction and non-extraction approaches.
▪️ Base treatment decisions on scientific evidence rather than social media trends or ideological preferences.
✍️ Conclusion
Premolar extraction in orthodontics is not an outdated procedure and remains a valuable treatment modality when properly indicated. The belief that premolar extractions should never be performed is not supported by current scientific evidence. Modern orthodontics emphasizes individualized treatment planning, recognizing that both extraction and non-extraction therapies can achieve excellent functional, esthetic, and stable outcomes.
Rather than asking whether premolars should always be extracted or never extracted, clinicians should determine whether extraction therapy provides the best overall benefit for each specific patient.
📚 References
✔ Kim, T. K., Kim, J. T., Mah, J., Yang, W. S., & Baek, S. H. (2015). First or second premolar extraction effects on facial vertical dimension. The Angle Orthodontist, 85(2), 177–182. https://doi.org/10.2319/010814-21.1
✔ Janson, G., Valarelli, F. P., Henriques, J. F. C., de Freitas, M. R., & Cançado, R. H. (2013). Stability of anterior open bite nonextraction and extraction treatment in the permanent dentition. American Journal of Orthodontics and Dentofacial Orthopedics, 144(6), 847–855. https://doi.org/10.1016/j.ajodo.2013.06.016
✔ Rinchuse, D. J., Rinchuse, D. J., & Greene, C. S. (2007). Orthodontic treatment and temporomandibular disorders: A review of the literature. The Angle Orthodontist, 77(4), 750–756.
✔ Proffit, W. R., Fields, H. W., Larson, B. E., & Sarver, D. M. (2019). Contemporary Orthodontics (6th ed.). Elsevier.
✔ Bellerive, A., Montpetit, A., Chvatal, J., & Major, P. W. (2021). Effects of orthodontic premolar extraction on the upper airway: A systematic review. European Journal of Orthodontics, 43(4), 430–437. https://doi.org/10.1093/ejo/cjaa070
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