Review (4/5): It didn't stain my 35 year old crown on my front incisor, as I feared it might
It didn't stain my 35 year old crown on my front incisor, as I feared and even the manufacturer warns can happen. They say to ask your dentist if you can safely use it on dental work, but since I go to a traditional dentist and not a biological one (not in our region) I didn't even bother to ask him. So, I didn't try this without anxiety and a possible ugly smile as an outcome.
Having used it 2-3x weekly for about 1 month, it appears to be slowly and evenly whitening my teeth. But the jury is still out on this. I'll follow up in another month or two and see then how it performs in my body over time. I am not using their toothpaste, as recommended, for I only wanted to take a chance with the powder, first.