[Object] The present invention relates to a sterilizer, an oral sterilizer, a sterilization method, a sterilization apparatus, and a sterilizer evaluation method capable of increasing a sterilization effect. [Solution] The sterilizer which contains hydrogen peroxide and a catalase activity inhibitor formed of scutellaria or green tea is brought into contact with a sterilization target such as a tooth and a denture in an oral cavity. Then, by using a light emitter formed of a semiconductor laser, light is irradiated onto the sterilization target at a wavelength of between 350 nm and 500 nm. As a result, the hydrogen peroxide is photolyzed to generate hydroxyl radicals, and sterilization may be performed by the hydroxyl radicals.
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