Review (4/5): Not sure how white it makes your teeth...
But..it does make them shiny! I use a regular manual brush since it does stain the brush. It gets everywhere...so be sure to put hot water in sink before you start. I end up spitting gray for a bit afterwards, so either rinse with mouthwash or give your teeth a good cleaning with your spinbrush/toothpaste afterwards. Doesn't taste bad but the grit clings pretty hard in your teeth.