An analytical tool comprising the following,, and: reagents for measuring parameters that reflect the dental caries risk for a test sample obtained from the oral cavity, wherein the parameters that reflect the dental caries risk are mutans bacteria count, pH, and acid buffering ability; reagents for measuring parameters that reflect the periodontal disease risk for said test sample obtained from the oral cavity, wherein the parameters that reflect the periodontal disease risk are total protein concentration, occult blood amount, and leukocyte count; and reagents for measuring parameters that reflect the degree of oral cleanliness for said test sample obtained from the oral cavity, wherein the parameters that reflect the degree of oral cleanliness are ammonia concentration and total protein concentration; wherein said analytical tool is a test piece comprising a support carrier and absorptive carriers that hold said respective reagents and are supported by said support carrier; wherein each of the parameters is measured by color reaction; wherein mutans bacteria count is measured by the resazurin method, the reagent for the measurement includes resazurin and 1-methoxy-5-methylphenazinium methosulfate, and the reaction time for the measurement is 1 to 10 minutes; wherein pH is measured by using a pH indicator, the reagent for the measurement includes the pH indicator, and the reaction time for the measurement is 30 seconds to 5 minutes; wherein acid buffering ability is measured by using an acid buffer and a pH indicator, the reagent for the measurement includes the acid buffer and the pH indicator, and the reaction time for the measurement is 30 seconds to 5 minutes; wherein total protein concentration is measured by the protein error method, the reagent for the measurement includes a pH indicator, and the reaction time for the measurement is 30 seconds to 5 minutes; wherein occult blood amount is measured by the hemoglobin contact activation method, the reagent for the measurement includes an indicator that changes color thereof upon oxidation and an oxygen donor, and the reaction time for the measurement is 30 seconds to 5 minutes; wherein leukocyte count is measured by the leukocyte esterase method, the reagent for the measurement includes an ester compound, and the reaction time for the measurement is 30 seconds to 5 minutes; and wherein ammonia concentration is measured by the microdiffusion method, the reagent for the measurement includes a pH indicator, and the reaction time for the measurement is 10 seconds to 5 minutes. reagents for measuring parameters that reflect the dental caries risk for a test sample obtained from the oral cavity, wherein the parameters that reflect the dental caries risk are mutans bacteria count, pH, and acid buffering ability; reagents for measuring parameters that reflect the periodontal disease risk for said test sample obtained from the oral cavity, wherein the parameters that reflect the periodontal disease risk are total protein concentration, occult blood amount, and leukocyte count; and reagents for measuring parameters that reflect the degree of oral cleanliness for said test sample obtained from the oral cavity, wherein the parameters that reflect the degree of oral cleanliness are ammonia concentration and total protein concentration;