do not use in a white sink!
Product works great for teeth but stains white sinks!!!  I have a 3 month old bathroom vanity with a white sink and top.  I had to spend 15 minutes scrubbing the hell out of it to get the color from these tablets out (started cleaning immediately after the tablets were used).  The product does work, I just advise using it over a kitchen/ stainless sink instead.
Rating: 3 stars