Introduction

Clear aligners have moved from a niche option to a routine request in Indian dental practices, and patients increasingly arrive asking whether aligners are "as good as braces". Answering that question responsibly requires evidence from randomised trials rather than from manufacturers' case galleries. A systematic review and meta-analysis by Baneshi, O'Malley, El-Angbawi and Thiruvenkatachari, published in the Journal of Evidence-Based Dental Practice in 2025, assessed the effectiveness of clear aligners in treating various malocclusions compared with fixed orthodontic appliances [PMID 39947778].

The authors rated the overall quality of the evidence as low, and the findings below should be read with that caveat in mind. This article summarises the review and translates its findings into practical guidance on case selection and patient counselling.

What the review did

The authors searched EMBASE, Medline, the Cochrane Library, LILACS, Web of Science and EBMR up to October 2024, supplemented by Google Scholar and PubMed, with no restrictions on language or publication date, and included only randomised controlled trials (RCTs). Risk of bias was assessed with the revised Cochrane RoB 2 tool [PMID 39947778].

The primary outcome was treatment accuracy, including tooth movement in anteroposterior, transverse and vertical dimensions and overjet; secondary outcomes included treatment duration, periodontal health, root resorption and patient satisfaction. Twenty-one RCTs, involving 970 participants, were selected from 600 records, and all compared clear aligners with fixed appliances [PMID 39947778].

Key findings

The principal findings reported in the review's abstract are as follows [PMID 39947778].

Risk of bias. The abstract reports that three studies were judged at high risk of bias, 14 at unclear risk and only one at low risk [PMID 39947778]. These figures total 18, not the 21 included trials; the abstract does not account for the remaining three, so the full text should be consulted for the complete assessment.
Treatment outcome. There was no significant difference between clear aligners and fixed appliances in ABO Objective Grading System scores, Little's Irregularity Index or PAR scores. Meta-analysis was possible only for secondary outcomes.
Periodontal indices. Plaque index (MD −0.76; 95% CI −1.14 to −0.38), gingival index (MD −0.61; 95% CI −0.78 to −0.44) and bleeding index (MD −0.71; 95% CI −0.92 to −0.49) were significantly lower with clear aligners, although the authors graded this evidence as low quality.
Quality of life. Quality of life at six months was significantly better with clear aligners (MD −4.37; 95% CI −6.93 to −1.80).
Other outcomes. Clear aligners also appeared to have better outcomes for chairside time, pain and root resorption.
Certainty. The overall quality of evidence was low; the evidence favouring aligners was low quality for periodontal health and moderate quality for quality of life.

Interpreting the results

The authors' conclusion is carefully bounded: both clear aligners and fixed appliances worked well in treating simple malocclusions treated on a non-extraction basis. They explicitly call for more high-quality studies evaluating aligner treatment of complex malocclusions [PMID 39947778]. The review therefore does not show that aligners are equivalent to fixed appliances across the full range of orthodontic problems; it shows comparable outcomes in the kinds of cases the trials mostly studied.

Clinical takeaways for the dental practitioner

1. Match the appliance to the case

For simple, non-extraction malocclusions, the evidence supports presenting aligners and fixed appliances as reasonable alternatives with similar finished-outcome scores. For complex cases, the absence of high-quality comparative evidence [PMID 39947778] means aligner treatment should be planned with caution (see also the evidence on Class II camouflage versus surgery for skeletal problems) and by clinicians with appropriate training, and patients should be told that evidence is limited.

2. Use the periodontal advantage, but do not overstate it

Lower plaque, gingival and bleeding indices with aligners are relevant for patients with a history of gingival inflammation or difficulty cleaning around brackets, but this finding rests on low-quality evidence [PMID 39947778]. A separate 2026 systematic review of six randomised trials, using GRADE, likewise found periodontal parameters better with aligners, yet judged five of the six trials at high risk of bias, rated certainty as very low for oral hygiene and low for periodontal health, and concluded that any advantage is highly compliance dependent and that a firm conclusion could not be drawn [PMID 42163541]. The periodontal difference should therefore be described to patients as possible rather than established, and oral hygiene instruction remains essential regardless of appliance.

3. Discuss quality of life and comfort honestly

The better six-month quality of life with aligners is supported by moderate-quality evidence, and aligners appeared favourable for pain and chairside time [PMID 39947778]. These are legitimate points in a shared decision-making conversation, especially for adult professionals. They should be balanced against the patient's ability to wear aligners as prescribed, which the abstract does not quantify.

4. Avoid unsupported claims in patient communication

Because the overall evidence quality was low, practices should avoid advertising aligners as "faster", "better" or "suitable for every case". The review reports no pooled advantage in finished outcome [PMID 39947778], and statements to patients should reflect that.

5. Plan and monitor systematically

Whichever appliance is chosen, structured records and regular monitoring visits help detect tracking problems or hygiene issues early. D4dent's doctor workspace includes orthodontic case management and WhatsApp patient messaging, and lab orders can help track appliance fabrication with partner laboratories. Retention planning is equally important after either appliance; the evidence on fixed retainer failure is summarised separately, and patients can be directed to D4dent's page on retainer and aligner care.

A consultation checklist

When a patient asks about aligners, the following sequence keeps the discussion anchored to the evidence [PMID 39947778]:

Classify the case. Is it a simple, non-extraction malocclusion, the setting in which both appliances worked well, or a complex case where comparative evidence is lacking?
State the outcome evidence plainly. In the trials reviewed, finished-outcome scores (ABO, Little's Irregularity Index and PAR) did not differ significantly between appliances.
Describe the likely benefits. Lower plaque, gingival and bleeding indices and better quality of life at six months were reported with aligners, the former on low-quality evidence.
Qualify the certainty. Explain that the overall quality of evidence was low.
Record the decision. Document the options discussed and the patient's reasons for their choice, so the rationale is available at every subsequent review.

Limitations to keep in mind

Only one trial was reported at low risk of bias, the primary outcomes could not be meta-analysed, and the included trials concentrated on simpler cases [PMID 39947778]. Clinicians should read the full paper before drawing conclusions about specific tooth movements.

Conclusion

Baneshi et al. provide the clearest current answer to the patient's question: in simple, non-extraction cases, clear aligners and fixed appliances produce similar results, with lower periodontal index scores (low-quality evidence) and better six-month quality of life (moderate-quality evidence) favouring aligners. The low certainty of the evidence, and the lack of robust data for complex malocclusions [PMID 39947778], should shape both case selection and how aligners are described to patients.

More in this series

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References

Baneshi M, O'Malley L, El-Angbawi A, Thiruvenkatachari B. EFFECTIVENESS OF CLEAR ORTHODONTIC ALIGNERS IN CORRECTING MALOCCLUSIONS: A SYSTEMATIC REVIEW AND META-ANALYSIS. J Evid Based Dent Pract. 2025 Mar;25(1):102081. PMID: 39947778
Alhuwaizi MA, Saloom HF, Cobourne M. Impact of clear aligners and conventional fixed orthodontic appliances on oral hygiene and periodontal health: A systematic review with GRADE assessment of the certainty of evidence. Eur J Orthod. 2026 Apr 3;48(3):cjaf100. PMID: 42163541

Clear Aligners Versus Fixed Appliances: What a 2025 Meta-Analysis Means for Dental Practice in India