The Purebrush Antibacterial Toothbrush Purifier uses a G4T5 UV light. This Ultra Violet light is called a "Germicidal Bulb" because of its ability to eliminated 99.9 % of all microorganisms. It has been tested and proven for over fifty years and has a life expectancy from one to three years based on the number people that are using the Purifier at the same time. (One UV G4T5 bulb is shipped per package).
