Cov no yog qhwv ntsej nyob rau hauv cov duab ntawm cov tshuaj fwj. "Rx" yog lub cim ntawm cov tshuaj noj, uas feem ntau tshwm sim ntawm cov tshuaj fwj. Hom qhwv ntsej no muaj tus qauv tsim tshwj xeeb thiab ua rau cov khoom kho mob fashionable. Cov khoom siv yog hlau, uas yog electroplated los nthuav qhia lub ntsej muag kub, thiab cov qauv saum npoo tau nthuav tawm hauv cov xim uas siv cov txheej txheem nyuaj enamel thiab luam ntawv.
