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Microplastic Particle Recovery from Orthodontic Appliances: An In Vitro Pilot Study Using Laser-Directed Infrared Spectroscopy
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Scientists tested clear aligners and nighttime retainers in artificial saliva to see if they shed tiny plastic particles (microplastics) into your mouth. They found that clear aligners released far more particles than nighttime-only retainers, over 1,000 in one case, though this was a small lab test, not a study of real people wearing these devices. More research is needed to know what this means for your health, but it's a useful first step in understanding a possible everyday source of microplastic exposure.
To quantify and characterize microplastic particles recovered from orthodontic appliances under simulated intraoral conditions using laser-directed infrared spectroscopy (LDIR), five maxillary orthodontic appliances were exposed to artificial saliva at 37 °C under calibrated agitation simulating nighttime (8 h) and full-time (20 h) wear over a 14-day period. A 1 mL aliquot retrieved from a 50 mL exposure volume was analyzed using LDIR to determine particle count, size, eccentricity, and polymer composition, with statistical analyses performed on an exploratory and polymer-stratified basis. Particle recovery ranged from 11–16 particles for nighttime appliances and increased substantially for aligners (SmartTrack: 341; Zendura: 1382). Multiple polymer types were identified, and no statistically significant differences in particle diameter or eccentricity were observed after multiplicity correction. These findings show that orthodontic appliances can generate recoverable microplastic particles under simulated conditions, establish a reproducible framework for automated microplastic characterization, and support future investigation into clinical exposure. Because the effective detection threshold of the LDIR workflow is approximately 20 µm, smaller microplastics and nanoplastics were not evaluated in this study.
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Microplastic Release from Clear Aligners: a Clinical Study
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Clear plastic teeth aligners, worn by millions to straighten teeth, can shed tiny plastic particles (microplastics and even smaller nanoplastics) into your saliva as you chew and wear them over time. This study is the first to measure this shedding directly in people's mouths, looking at how wear time and cleaning habits affect how much plastic breaks off. Since we don't yet fully know the health effects of swallowing these particles, this research is an important first step in understanding a possible hidden source of microplastic exposure in everyday dental care.
Microplastic Release from Clear Aligners: a Clinical Study
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Clear teeth aligners, the plastic trays used instead of metal braces, can shed tiny plastic particles into your saliva as you wear and chew with them, according to this study. Researchers found that factors like how long you wear them each day and how you clean them affect how much plastic breaks off, meaning your daily habits could influence how much of this material ends up in your mouth. Since scientists are still learning what micro- and nanoplastics do to the body long-term, this research highlights an overlooked source of exposure worth paying attention to as more people use clear aligners for orthodontic treatment.
Evaluation of microplastic release from orthodontic clear aligner – A spectroscopic study
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Researchers evaluated microplastic release from orthodontic clear aligners under simulated oral conditions using Raman microspectroscopy and scanning electron microscopy. The study found that mechanical friction in the mouth can cause these dental devices to shed microplastic particles, raising questions about an overlooked source of direct microplastic exposure for the millions of people who use clear aligners.
A spectroscopic study on orthodontic aligners: First evidence of secondary microplastic detachment after seven days of artificial saliva exposure
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Researchers investigated whether clear orthodontic aligners release microplastics when exposed to artificial saliva over seven days. The study found evidence of microplastic detachment from aligners made by multiple manufacturers, representing the first documentation of secondary microplastic release from these dental devices. The findings raise questions about potential microplastic ingestion by the millions of people who use clear aligners.
Orthodontic Clear Aligners as a Potential Source of Microplastic Exposure: Implications for Human Health and Environmental Sustainability
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If you're using clear plastic aligners to straighten your teeth (like Invisalign), this review of existing research suggests that everyday wear and tear from chewing and saliva may cause them to shed tiny plastic particles into your mouth. Scientists don't yet know how much this affects your health, but it adds to growing concerns about microplastics — tiny plastic fragments already found throughout the human body — while also raising questions about the environmental waste from millions of discarded aligners. More research is needed before we know if this is something to actually worry about.
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