METHOD FOR DETERMINING STAGE OF PERIODONTAL DISEASE

It is an object of the present invention to provide a method for objectively and highly accurately determining a stage of a periodontal disease on the basis of a measurement result of an examination object obtained from an oral cavity. A method for determining the stage of a periodontal disease by using as an index the amount of occult blood, and the number of white blood cells or a total protein concentration in the examination object obtained from the oral cavity, the method includes: a step of determining whether the amount of occult blood is positive or negative; a step of determining whether the number of white blood cells is positive or negative when the amount of occult blood is positive; or a step of determining whether the total protein concentration is positive or negative when the amount of occult blood is negative. Preferably, the method further includes a step of using an ammonia concentration as an index and determining whether the ammonia concentration is positive or negative.