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Comparison between SEM micrographs of Invisalign (IL) aligner before and after 2 weeks of immersion into staining beverages; (a,b) as-received sample; (c,d) sample immersed into artificial saliva (A); (e,f) sample immersed into nicotine (B); (g,h) sample immersed into red wine (C); (i,j) sample immersed into coffee (D).
