Fig. 2. Q-ray fluorescence images of the 6 incisors of the subjects before and after flossing. (A) Q-ray fluorescence images were obtained before and after flossing for the maxillary and mandibular 6 incisors of three groups of subjects (thread type floss, C type, and Y type). Representative Q-ray images for each group were provided. (B) The degree of plaque was analyzed using the Area R30 value in the QA2 program, and the Area R30 intensity score was graphed before and after the application of dental floss. *p-value was determined from Wilcoxon signed rank test (n=10/group).