A method for preventing periodontal disease, which comprises administering an effective amount of a composition to a method for preventing periodontal disease comprising administering an effective amount of a composition to a part in an oral cavity before a periodontal disease-related bacteria, a decayed teeth-related bacteria, and/or Candida spp. is/are abnormally proliferated in the oral cavity, wherein said composition comprises a Sasa extract and malic acid.
