AIM: To evaluate the effect of dentifrice (Crest Whitening-containing polyphosphate, and Crest anti-cavity, P&G Co.) on wetting of enamel surfaces in vitro by measuring contact angles.

• 摘要目的：研究比较佳洁士皓爽白牙膏、防蛀牙膏对离体牙釉质表面润湿性的影响。