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The purpose of this study was to compare the status of oral hygiene and bleeding upon probing between patients and persons without chief complaint. 706 subjects were selected for this study. The subjects were divided into two groups: A group; 353 patients in a dental hospital, B group; 353 individuals from large cities surveyed. The used indices were P.L Plaque Index), C.L(Calculus Index), G.B.I.(Gingival Bleeding Index), O.H.L(Oral Hygiene Index). The results were as follows: 1. In PI, the total mean value of A group (1.74 ± 0.54) was larger than that of B group (1.66 ± 0.75). There was no statistically significant difference in total teeth, but there was statistically significant difference in upper and lower posterior teeth between A and B group (p < 0.01). 2. In CI, the total mean value of A group (1.67 ± 0.64) was larger than that of B group (1.42 ± 0.93). There was statistically significant difference in total teeth, but there was no statistically significant difference in upper and lower anterior teeth between A and B group (p <0.01). 3. The OHI was increased by aging in A and B group, the value of B group was larger than that of A group and the value of males was larger than that of females. There was statistically significant difference in each age group and sex between A and B group (p < 0.01). 4. In GBI, the total mean value of A group (0.58 ± 0.30) was larger than that of B group (0.29 ± 0.33) and there was statistically significant difference in total teeth, each age group and sex between A and B group (p < 0.01). The GBI was increased by aging in A and B group. 5. Correlation was showed positive in each clinical parameter, especially; the value of correlation coefficient (r) between P.I. and C.I. is higher than other values of that in A and B group. (A group: r=0.857, B group: r=0.979, p < 0.001)
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