The present invention relates to an oral cleansing composition containing a fermented taraxacum extract-containing complex herbal extract as an active ingredient, and a composition for preventing or treating bacterial dental diseases or periodontal diseases. According to the present invention, the complex herbal extract comprises a fermented taraxacum extract in which raw taraxacum is solid-fermented using a Phellinus linteus mycelium, a dried clover bud extract, a mint extract, a cnidium extract; and a licorice extract. Accordingly, the present invention has excellent elimination activity of DPPH free radicals, nitrite, super-oxi free radicals, and hydroxy free radicals and high total phenol content, thereby having an excellent antioxidant and antibacterial effect, and being useful for preventing, alleviating, or treating bacterial dental diseases and periodontal diseases such as a cold, a sore throat, and mouth ulcer.
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