Influence of Coca-Cola® on Thermoplastic Degradation in Clear Orthodontic Aligners

Clear orthodontic aligners, primarily composed of thermoplastic polymers, are increasingly popular but susceptible to degradation through thermal, chemical, and mechanical stress. This preliminary pilot study assessed the release of microplastics from two commercial aligner brands under simulated oral conditions. Aligners were exposed to daily cycles of Coca-Cola® or artificial saliva, with mechanical agitation replicating masticatory friction. Fourier-transform infrared spectroscopy confirmed microplastic release in both environments, with a notably higher particle count after Coca-Cola® exposure. These findings indicate the potential health and environmental risks linked to acidic beverage consumption during orthodontic treatment. Further comprehensive studies are required to validate and expand upon these results.