Cybersonic is a site by Amden Corporation that sells dental products, The main product is an electric toothbrush with a lifetime warranty and free brush replacement every 3 months if you like. You cannot go wrong with purchasing the Cybersonic toothbrush with free replacement even for just wearing out your unit because it is aged. Next time you need a great toothbrush look at this one. It's reasonable and it lasts a lifetime!