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Clear Aligners as a Prescribed Source of Unmeasured Intra-Oral Micro- and Nanoplastic Exposure: Release Mechanisms, Human Evidence, Salivary Biomonitoring and the EU Regulatory Context
Summary
Clear plastic teeth aligners, worn nearly all day for months by kids and adults straightening their teeth, may shed tiny plastic particles and other substances into your mouth, according to this review of existing lab studies. The catch: nobody has actually measured how much of this plastic ends up in wearers' saliva or bodies yet, so scientists are calling for real-world testing (especially in children) before these devices become even more widely used. This matters because it adds to growing questions about everyday exposure to microplastics, even from sources we don't usually think of as "plastic products."
Clear orthodontic aligners are removable polymer devices worn about 22 h a day for 12 to 24 months, increasingly by children. A growing in vitro literature shows that thermoformed and 3D-printed aligners shed micro- and nanoplastics and co-release elemental or organic constituents under oral, gastric and mechanical conditions, yet aligner-derived particle burden and systemic dose in wearers have not been measured. This review sets aligner-derived release against the wider human micro- and nanoplastic record and evaluates saliva as a biomonitoring matrix. Directly printed devices release more and larger microplastics under mechanical stress, whereas thermoformed materials show acid-related degradation, with Sb/Sn release and nanometre-scale particles reported in a single, not yet replicated in vitro study. Particles below 5 microns, especially below 1 micron, are plausible translocation candidates, but translocation of aligner-derived particles has not been demonstrated. In vitro work reports macrophage and oxidative responses, whereas detections in blood, placenta and atheroma are not source-specific and remain associative. The EU amalgam phase-out does not regulate aligners but highlights a substitution question, because device and chemicals law addresses intentionally added microplastics, not wear-generated secondary particles. ICP-MS for antimony and tin, with Raman, micro-FTIR and electron microscopy, forms a plausible analytical toolbox. We propose harmonised release testing and validated salivary biomonitoring, prioritising children, to characterise source-proximal exposure before use expands.