Orthodontic treatment is usually discussed in terms of alignment, occlusion, esthetics, periodontal effects, and root resorption. Less visible, but clinically important, is what may happen inside the tooth. A recent systematic review, Occurrence of Dental Pulp Calcifications After Orthodontic Treatment, brings that question into sharper focus. The review evaluated whether orthodontic tooth movement is associated with dental pulp calcifications, particularly pulp stones, after fixed appliances or clear aligner therapy.
The central finding is cautious but important: orthodontically treated teeth may show a higher occurrence of pulpal calcifications, especially pulp stones, but the certainty of evidence remains low to very low. The review included 18 studies and found substantial heterogeneity in study design, imaging method, tooth type, follow-up, and outcome definition. Because of that variability, the authors appropriately avoided overclaiming causation.
Clinically, this matters because pulp calcification is not simply a radiographic curiosity. Pulp stones and calcific changes can complicate access, obscure canal anatomy, increase the risk of procedural errors, and make endodontic treatment more technically demanding. Yet the review also emphasizes that these changes were generally asymptomatic and not clearly associated with loss of vitality.
The biological explanation is plausible. Orthodontic force can act as a chronic, controlled stimulus to the pulp-dentin complex. Rather than producing overt pulpal breakdown, it may trigger adaptive responses such as altered blood flow, vascular congestion, fibrosis, tertiary dentin deposition, or localized mineralization. Reviews of pulpal response to orthodontic forces have similarly described transient reductions in pulpal blood flow and changes in sensibility testing, reinforcing that orthodontic tooth movement is biologically active within the tooth, not only around it.
One of the most relevant observations is that molars appear more frequently affected. That makes practical sense: molars have larger pulp chambers, complex anatomy, greater restorative histories, and higher baseline likelihood of calcifications with age. For the endodontist, a history of orthodontic treatment should therefore be part of the diagnostic and access-planning conversation, especially when treating posterior teeth.
The fixed-appliance versus clear-aligner question remains unresolved. The review found only limited comparative evidence and no meaningful demonstrated difference between fixed appliances and clear aligners. That point is important because it avoids turning this into a marketing claim against one appliance category. The issue is likely less about appliance branding and more about force magnitude, duration, tooth type, patient age, baseline pulpal status, and diagnostic method.
From a RootRadar perspective, the deeper message is diagnostic. Pulpal calcification after orthodontics may be a small biological signal of how the pulp-dentin complex responds to long-term mechanical stress. It does not mean that orthodontics “damages” the pulp in a simplistic sense. But it does remind us that teeth are living tissues, and that radiographic interpretation must integrate treatment history, vitality testing, symptoms, restorative status, age, and risk trajectory.
This is also where AI-assisted diagnostics may eventually become useful. The future is not merely detecting a pulp stone after it has formed, but identifying patterns of pulpal volume change, calcific progression, treatment history, and patient-level risk before clinical complexity emerges.
Clinical Takeaway
Orthodontic treatment may modestly increase the occurrence of pulpal calcifications, particularly pulp stones in molars, but current evidence does not establish a strong causal relationship or suggest routine loss of vitality. For clinicians, the practical implication is not alarm, but awareness: orthodontic history should inform radiographic interpretation, vitality testing, access planning, and endodontic risk assessment.
References
Pouliezou I, Katanaki N, Sokratous S, Kerezoudis NP, Sifakakis I. Occurrence of dental pulp calcifications after orthodontic treatment: A systematic review. International Orthodontics. 2026
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