An anti-dry mouth humidifier is a home device that adds moisture to the air while you sleep. Increasing room humidity helps prevent dry mouth, throat irritation, and discomfort that can occur during the night, especially for people who breathe through their mouth, use orthodontic appliances, or take medications that reduce saliva. it is made of Plastic outer body, water tank, ultrasonic or evaporative humidifying system, and electrical components.