“…More than 96% of the students of both countries had gingival bleeding after gentle probing (Code 1> or worse symptoms (Code [2][3] (Table 1). In the Japanese college students, the mean number of sextants with bleeding or worse symptoms was 4.0 (females) and 4.6 (males), and that of sextants affected with calculus or worse was 3.5 (females) and 4.0 (males).…”