Mouthwash shelf life is usually around one to two years, and the shelf life will vary somewhat between different products. Mouthwash is one of the commonly used oral care products that can effectively reduce bacteria and plaque in the mouth to prevent gingivitis and periodontitis, eliminate bad taste and clean the mouth. The shelf life of mouthwash is generally about one to two years, but in the case of unsealing, it is recommended to use up within a month to prevent the failure of the medicinal ingredients in the mouthwash and the loss of antibacterial and anti-inflammatory effects. Mouthwash is generally recommended to be used two to three times a day for about a week; and mouthwash is recommended to be used under the guidance of a doctor, and should not be purchased and used on your own.