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Original research — experimental, observational, or case-control study. Direct primary evidence.
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Aligners do shed microplastics: Evidence is clear, clinical risk is not
The Korean Journal of Orthodontics
2026
Sung-Hoon Lim
Summary
Clear aligners (the plastic trays used instead of metal braces) do release tiny plastic particles called microplastics as you wear them, according to this review of existing research. However, scientists still don't know whether these small amounts actually cause health problems, so the takeaway isn't "stop using aligners" but rather "more research is needed" to understand any real-world risk.
good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.