The present invention provides a method for evaluating oral health, in particularly for evaluating a risk for suffering from periodontal disease, comprising: (1) providing an oral sample of a subject; (2) detecting at least two indicator microbes in the oral sample; and (3) analyzing amounts of the at least two indicator microbes; wherein when each of the amounts of the at least two indicator microbes is higher than a standard value for an amount of a corresponding indicator microbe, it indicates that the subject has a high risk for suffering from periodontal disease.
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