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Clear aligner therapy may improve plaque control compared to fixed appliances in orthodontic patientsClear aligners may improve gum health compared to fixed braces

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Key Takeaway
Note that clear aligner therapy may improve plaque control but requires strict hygiene adherence to mitigate biofilm risks.

This narrative review synthesizes current literature regarding the use of thermoplastic and polyurethane polymers in clear aligner therapy (CAT). The scope includes clinical outcomes such as plaque control and periodontal health, alongside microbiological factors like bacterial and fungal biofilm growth. The authors note that while CAT may improve plaque control compared to fixed appliances, these results are heavily influenced by patient behavior, baseline caries risk, treatment duration, and adherence to hygiene and dietary guidelines.

Regarding oral health risks, the review indicates that aligner materials can support bacterial and fungal biofilm growth. Additionally, certain conditions may lead to enamel demineralization or erosion. The authors also address environmental impacts, including polymer production, energy-intensive manufacturing, packaging, distribution, and potential microplastic release from these materials.

Clinical practice relevance is centered on the need for personalized risk assessments and rigorous aligner maintenance protocols. Practitioners should consider life-cycle-based strategies to manage both clinical outcomes and environmental sustainability. The findings are limited by the nature of narrative reviews and a lack of specific quantitative metrics regarding environmental impact.

Choosing between clear aligners and traditional metal braces involves more than just aesthetics. While many people prefer the invisible look of plastic aligners, these materials come with specific dental risks. Research shows that aligner therapy can actually improve gum health and plaque control compared to fixed appliances. However, these benefits depend heavily on how well a patient follows hygiene routines and manages their diet.

There are some trade-offs to consider when choosing clear aligners. The plastic materials used in the trays can support the growth of bacteria and fungi, which creates a biofilm on the teeth. In certain conditions, this process can lead to enamel demineralization or erosion, which is the wearing down of the protective outer layer of the tooth. Because these results come from a narrative review of existing research, the evidence is still being gathered. Doctors suggest that patients need personalized risk assessments and strict maintenance plans. This ensures that while you are straightening your teeth, you are also protecting your enamel and maintaining healthy gums.

What this means for you:
Clear aligners can improve gum health but require strict cleaning to prevent bacteria growth and enamel damage.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedJun 2026
View Original Abstract ↓
Clear aligner therapy (CAT) has become a popular orthodontic option, driven by advances in digital workflows, increasing aesthetic demands, and perceived benefits in comfort and oral hygiene. Although its clinical effectiveness has been well documented, a thorough review of its biological and environmental effects remains incomplete. This narrative review consolidates current evidence on CAT, exploring their history, material makeup, impact on oral health, and emerging environmental concerns. Recent clinical and microbiological research indicates that CAT may improve plaque control and periodontal health compared with fixed appliances; however, these benefits are heavily influenced by patient behavior, baseline caries risk, treatment duration, and adherence to hygiene and dietary guidelines. Evidence shows that aligner materials can support bacterial and fungal biofilm growth and, under certain conditions, may lead to enamel demineralization or erosion, emphasizing the need for personalized risk assessments and proper aligner maintenance. From a materials standpoint, modern aligners are primarily made from thermoplastic and polyurethane polymers, designed to exert controlled orthodontic forces and ensure durability. While beneficial clinically, these materials are poorly degradable and have limited recyclability. Life cycle analyses reveal that the environmental impact of CAT extends beyond disposal to include polymer production, energy-intensive manufacturing, packaging, and distribution. Additionally, emerging research suggests that aligners may release microplastics during use, adding to concerns about plastic pollution beyond solid waste. Given the rapid growth of the global clear aligner market, even small amounts of material per patient can result in a significant environmental impact. Overall, the evidence indicates that clear aligner therapy involves a complex interplay among biomechanics, patient care, materials science, and environmental sustainability. An integrated, life–cycle–based strategy is crucial to guiding clinicians, researchers, and manufacturers toward treatments that are both effective and environmentally responsible.
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