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Bleaching effect of ozone on pigmented teeth:

Vagharedin Akhavan Zanjani ; Amir Ghasemi ; Hassan Torabzadeh...
http://www.drjjournal.net/article.asp?issn=1735-3327;year=2015;volume=12;issue=1;spage=20;epage=24;aulast=Zanjani.  , 2015